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
I'm not certain why cups-pdf is listed there but will dig into it.
** Package changed: update-manager (Ubuntu) => ubuntu-release-upgrader
(Ubuntu)
** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided => Medium
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Triaged
** Changed in: cups-pdf (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/987026
Title:
cups-pdf package removed at each ubuntu version upgrade
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