Gestion des priorités

On ajoute les fichiers suivants :

# vi /etc/apt/preferences.d/stable.pref

# 500 <= P < 990: causes a version to be installed unless there is a
# version available belonging to the target release or the installed
# version is more recent

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

# vi /etc/apt/preferences.d/testing.pref

# 100 <= P < 500: causes a version to be installed unless there is a
# version available belonging to some other distribution or the installed
# version is more recent 

Package: *
Pin: release a=testing
Pin-Priority: 400

# vi /etc/apt/preferences.d/unstable.pref

# 0 < P < 100: causes a version to be installed only if there is no
# installed version of the package

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

# vi /etc/apt/preferences.d/experimental.pref

# 0 < P < 100: causes a version to be installed only if there is no
# installed version of the package

Package: *
Pin: release a=experimental
Pin-Priority: 1