To make things easier here is my comment:
It's actually ubuntu-release-upgrader that handles the distribution
upgrade logic now and it does have some logic for dealing with specific
packages. This can be seen in DistUpgrade.cfg:
# information about the individual meta-pkgs
[ubuntu-desktop]
KeyDependencies=lightdm, unity, ubuntu-artwork, ubuntu-sounds
# those pkgs will be marked remove right after the distUpgrade in the cache
PostUpgradeRemove=xscreensaver, gnome-cups-manager, powermanagement-interface,
deskbar-applet, nautilus-cd-burner
ForcedObsoletes=desktop-effects, cups-pdf, gnome-app-install, policykit-gnome,
gnome-mount
and I believe it was put in ForcedObsoletes when cups-pdf became
unseeded.
update-manager (1:0.93.4) intrepid; urgency=low
* DistUpgrade/removal_blacklist.cfg:
- add openssh-blacklist-extra and openssh-extra
* UpdateManager/UpdateManager.py:
- do not crash if lsb_release can not be run (LP: #255319)
* DistUpgrade/DistUpgradeApport.py:
- do not generate apport reports against a package if
the error indicates that its a full disk, this is a bug
in update-manager than (failed to do the full disk checking)
* DistUpgrade/DistUpgrade.cfg:
- force obsoletion of cups-pdf on ubuntu-desktop, kubuntu-desktop
and xubuntu-desktop
* DistUpgrade/DistUpgradeController.py:
- increase KERNEL_INITRD_SIZE a bit
-- Michael Vogt <[email protected]> Fri, 15 Aug 2008 19:40:46
+0200
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Triaged
** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/457221
Title:
cups-pdf always classed as OBSOLETE and removed during update-manager
process.
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