APT_PREFERENCES(5)                    APT                   APT_PREFERENCES(5)

<?><?>
       apt_preferences - APT <?><?><?><?><?><?><?><?><?>

<?><?>
       APT <?><?><?><?><?><?><?><?><?><?><?> /etc/apt/preferences <?>
       /etc/apt/preferences.d/
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> (stable <?>
       testing <?><?>)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       <?> sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>!
       APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>/<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       (<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>)<?><?><?><?><?><?><?><?><?><?><?>

       Note that the files in the /etc/apt/preferences.d directory need to
       obey the following naming convention: The files have either no or
       "pref" as filename extension and only contain alphanumeric, hyphen (-),
       underscore (_) and period (.) characters. Otherwise APT will print a
       notice that it has ignored a file, unless that file matches a pattern
       in the Dir::Ignore-Files-Silently configuration list - in which case it
       will be silently ignored.

       /etc/apt/preferences is parsed first, followed by the files in
       /etc/apt/preferences.d in lexicographic order. For example,
       /etc/apt/preferences.d/00-high-priority.pref,
       /etc/apt/preferences.d/50-mid-priority and
       /etc/apt/preferences.d/z-low-priority.pref would be parsed in that
       order.

   APT <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       <?><?><?><?><?><?><?><?><?><?>APT <?><?><?><?><?><?> /etc/apt/apt.conf
       <?><?><?><?><?><?><?><?><?><?><?><?> /etc/apt/preferences
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>pin
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install -t testing some-package



           APT::Default-Release "stable";

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?> 1
           to the versions coming from archives which in their Release files
           are marked as "NotAutomatic: yes" but not as "ButAutomaticUpgrades:
           yes" like the Debian experimental archive, as well as versions that
           are not phased on this systems.

       <?><?><?> 100
           (<?><?><?><?><?>)
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>squeeze-backports
           <?><?><?><?><?> Debian
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>Release
           <?><?><?><?><?> "NotAutomatic: yes" <?><?> "ButAutomaticUpgrades:
           yes"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?> 500
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?> 990
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       100
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       500 <?><?><?><?><?><?><?><?><?><?><?><?>Release <?><?><?><?><?>
       "NotAutomatic: yes"
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       1 <?><?><?><?><?><?><?><?><?> "ButAutomaticUpgrades: yes"
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> 100
       <?><?><?><?><?><?><?><?>

       APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       o   Never downgrade unless the priority of an available version is at
           least 1000. ("Downgrading" is installing a less recent version of a
           package in place of a more recent version. Note that all of APT's
           default priorities are less than 1000; higher priorities can only
           be set in the preferences file. Note also that downgrading a
           package can be risky.)

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           (<?><?><?><?><?><?><?><?><?><?><?><?><?><?>)
           <?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           --reinstall
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       (<?><?><?> 100) <?><?>sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> (<?><?><?>
       500 <?> 990)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       install some-package <?> apt-get upgrade
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       apt-get install some-package <?> apt-get upgrade
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       apt-get install some-package <?> apt-get upgrade
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

   Phased Updates
       APT understands a field called Phased-Update-Percentage which can be
       used to control the rollout of a new version. It is an integer between
       0 and 100.

       A system's eligibility to a phased update is determined by seeding
       random number generator with the package source name, the version
       number, and /etc/machine-id, and then calculating an integer in the
       range [0, 100]. If this integer is larger than the
       Phased-Update-Percentage, the version is pinned to 1, and thus held
       back. Otherwise, normal policy rules apply.

       In case you have multiple systems that you want to receive the same set
       of updates, you can set APT::Machine-ID to a UUID such that they all
       phase the same, or set APT::Get::Never-Include-Phased-Updates or
       APT::Get::Always-Include-Phased-Updates to true such that APT will
       never/always consider phased updates.

   APT <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?><?> ("Pin-Priority")
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           "5.32" <?><?><?><?> perl
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: perl
               Pin: version 5.32*
               Pin-Priority: 1001

           Since 2.9.9, you can also pin by a source version:

               Package: perl
               Pin: source-version 5.32*
               Pin-Priority: 1001

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           (Release <?><?><?><?><?><?><?><?><?><?><?><?><?><?>)
           <?><?><?><?><?><?>FQDN<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: *
               Pin: origin ""
               Pin-Priority: 999

           <?><?>:
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           "origin" <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           "ftp.de.debian.org"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: *
               Pin: origin "ftp.de.debian.org"
               Pin-Priority: 999

           Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           Origin <?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>Release
           <?><?><?><?><?><?><?> "Origin:"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>"Debian"
           <?> "Ximian" <?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> "unstable"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: *
               Pin: release a=unstable
               Pin-Priority: 50

           <?><?><?><?><?><?><?><?><?><?><?><?><?><?> "forky"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: *
               Pin: release n=forky
               Pin-Priority: 900

           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> "stable"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?> "13"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Package: *
               Pin: release a=stable, v=13
               Pin-Priority: 500

       <?><?><?><?><?><?><?><?><?><?> "and" <?><?><?><?><?><?><?><?>:
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>:
       <?><?><?><?><?><?><?><?><?><?><?> (<?><?><?><?><?><?><?> "a"
       <?><?>)<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

   Matching packages in the Package field
       The Package field specifies the package that a pinning priority is
       applied to. The field can either contain a binary package name, a
       source package name (prefixed with "src:"), a glob(7) expression or a
       regular expression (surrounded by slashes). Multiple package names,
       glob(7) expressions and regular expressions can be listed separated by
       whitespace in which case the record will match any of the matched
       packages.

       By default, only packages of the native architecture are matched. To
       match binary packages of any architecture, add the :any suffix to the
       package name. You can also limit matching to a specific architecture by
       appending the architecture name to the package name, separated by a
       colon character.

       For example, the following example uses a glob expression and a regular
       expression to assign the priority 500 to all packages from experimental
       where the name starts with gnome (as a glob(7)-like expression) or
       contains the word kde (as a POSIX extended regular expression
       surrounded by slashes).

           Package: gnome* /kde/
           Pin: release a=experimental
           Pin-Priority: 500

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       pin <?><?>plucky
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       990 <?><?><?><?><?><?><?><?>

           Package: *
           Pin: release n=plucky*
           Pin-Priority: 990

       Package
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       pin
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       pin <?><?><?><?><?><?><?><?><?>Package <?><?><?><?><?><?> "*"
       <?><?><?><?><?><?>glob(7) <?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       To pin all binaries produced by the apt source package of this APT's
       version to 990, you can do:

           Package: src:apt
           Pin: version 3.3.3
           Pin-Priority: 990

       Source package pinning can be combined with regular expressions and
       glob patterns, and can also take a binary architecture.

       For example, let's pin all binaries for all architectures produced by
       any source package containing apt in its name to 990:

           Package: src:*apt*:any
           Pin: version *
           Pin-Priority: 990

       The :any suffix makes sure to select binary packages from any
       architecture. Without that suffix, apt implicitly assumes the :native
       suffix which would only select packages from the native architecture.

   APT <?><?><?><?><?><?><?><?><?><?><?>
       APT <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> (P)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       (<?><?><?><?><?><?><?><?><?>) <?><?><?><?><?><?><?><?><?><?><?><?><?>

       P >= 1000
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       990 <= P < 1000
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       500 <= P < 990
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       100 <= P < 500
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       0 < P < 100
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       P < 0
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       P = 0
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       <?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           Package: perl
           Pin: version 5.32*
           Pin-Priority: 1001

           Package: *
           Pin: origin ""
           Pin-Priority: 999

           Package: *
           Pin: release unstable
           Pin-Priority: 50

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?> "5.32" <?><?><?><?><?><?><?><?><?>perl
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           5.32* <?><?><?><?><?><?><?><?><?><?><?><?> 5.36*
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>perl
           <?><?><?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?>perl
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           (<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>)
           <?><?><?><?><?><?><?><?><?><?><?>

       o   <?><?><?><?><?><?><?><?><?><?><?><?><?><?> sources.list(5)
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>unstable
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>


   <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>Packages
       <?><?><?><?><?> Release <?><?><?><?><?><?><?><?><?><?><?>

       Packages <?><?><?><?><?><?><?> .../dists/dist-name/component/arch
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.../dists/stable/main/binary-i386/Packages
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> 2
       <?><?><?><?><?><?>

       Package: <?>
           <?><?><?><?><?><?>

       Version: <?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

       Release <?><?><?><?><?><?><?><?> .../dists/dist-name
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.../dists/stable/Release
       <?> .../dists/trixie/Release
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       1 <?><?><?><?><?><?><?><?><?><?>Packages <?><?><?><?><?><?><?> Release
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?>

       Archive: <?><?> Suite: <?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>"Archive:
           stable" <?> "Suite: stable" <?><?><?><?><?><?>Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>stable
           <?><?><?><?><?><?><?><?><?><?><?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release a=stable

       Codename: <?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>"Codename:
           forky" <?><?><?><?><?><?>Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>forky
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release n=forky

       Version: <?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>Debian
           <?><?><?><?><?><?><?><?><?> 13 <?><?><?><?><?><?><?><?><?><?><?>
           testing <?><?><?><?><?><?><?><?><?><?><?><?> unstable
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release v=13
               Pin: release a=stable, v=13
               Pin: release 13

       Component: <?>
           Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>"Component:
           main"
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>main
           <?><?><?><?><?><?><?> (Debian
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>)
           <?><?><?><?><?><?><?><?><?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release c=main

       Origin: <?>
           Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           Debian <?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release o=Debian

       Label: <?>
           Release
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           Debian <?><?><?>APT
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

               Pin: release l=Debian

       sources.list(5) <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       Packages <?><?><?><?><?> Release
       <?><?><?><?><?><?><?><?><?>/var/lib/apt/lists
       <?><?><?><?><?><?><?><?>apt.conf <?><?><?><?><?> Dir::State::Lists
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>debian.lcs.mit.edu_debian_dists_unstable_contrib_binary-i386_Release
       <?><?><?><?><?><?>debian.lcs.mit.edu <?><?><?><?><?><?><?>unstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?>contrib
       <?><?><?><?><?><?><?><?><?>binary-i386 <?><?><?><?><?><?><?><?><?>
       Release <?><?><?><?><?><?><?><?><?><?><?><?>

   APT <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       Explanation:
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

<?><?><?><?>
   <?><?><?><?><?><?>
       <?><?><?> APT <?><?><?><?><?><?><?><?><?><?><?><?><?>stable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       (500) <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> Debian
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           Explanation: Uninstall or do not install any Debian-originated
           Explanation: package versions other than those in the stable distro
           Package: *
           Pin: release a=stable
           Pin-Priority: 900

           Package: *
           Pin: release o=Debian
           Pin-Priority: -10

       <?><?><?> sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       stable <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package-name
           apt-get upgrade
           apt-get dist-upgrade

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> testing
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package/testing


   <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?> APT <?><?><?><?><?><?><?><?><?><?><?><?><?>testing
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>unstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       Debian
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           Package: *
           Pin: release a=testing
           Pin-Priority: 900

           Package: *
           Pin: release a=unstable
           Pin-Priority: 800

           Package: *
           Pin: release o=Debian
           Pin-Priority: -10

       <?><?><?> sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       testing <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package-name
           apt-get upgrade
           apt-get dist-upgrade

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> unstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       upgrade <?> testing
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> testing
       <?><?><?><?><?><?>unstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> unstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package/unstable


   <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?> APT
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       (500) <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> Debian
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       APT <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>APT <?> testing
       <?><?><?><?><?><?><?><?>stable <?><?><?><?> oldstable
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> testing
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           Explanation: Uninstall or do not install any Debian-originated package versions
           Explanation: other than those in the distribution codenamed with forky or sid
           Package: *
           Pin: release n=forky
           Pin-Priority: 900

           Explanation: Debian unstable is always codenamed with sid
           Package: *
           Pin: release n=sid
           Pin-Priority: 800

           Package: *
           Pin: release o=Debian
           Pin-Priority: -10

       <?><?><?> sources.list(5)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       forky
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package-name
           apt-get upgrade
           apt-get dist-upgrade

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> sid
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>apt-get
       upgrade <?> forky
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> forky
       <?><?><?><?><?><?>sid
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       sid<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

           apt-get install package/sid


<?><?><?><?>
       /etc/apt/preferences
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
           "pin"<?><?><?><?><?><?><?><?><?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           <?><?><?><?>: Dir::Etc::Preferences

       /etc/apt/preferences.d/
           <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
           <?><?><?><?>: Dir::Etc::PreferencesParts

<?><?><?><?>
       apt-get(8) apt-cache(8) apt.conf(5) sources.list(5)

<?><?>
       APT <?><?><?><?><?>[1] <?><?><?><?><?><?><?><?> APT
       <?><?><?><?><?><?><?><?><?><?><?><?>
       /usr/share/doc/debian/bug-reporting.txt <?> reportbug(1)
       <?><?><?><?><?><?><?><?><?><?><?><?>

<?><?>
       <?><?> <?> <nabetaro@debian.or.jp> (2003-2006,2009-2012), Takuma Yamada
       <tyamada@takumayamada.com> (2016), Debian JP Documentation ML
       <debian-doc@debian.or.jp>

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

<?><?>
       [FAMILY Given]

<?><?>
        1. APT <?><?><?><?><?>
           https://bugs.debian.org/src:apt

APT 3.3.3                       16 12 <?> 2025              APT_PREFERENCES(5)