I think I sorted it out.
The problem is that the meta packages ubuntu-desktop and xubuntu-desktop are
both installed.
ubuntu-desktop depends on notify-osd which provides notification-daemon.
xubuntu-desktop depends on xfce4-notifyd which both provides and conflicts with
notification-daemon.
and finally there is a PostUpgradeRemove rule in update-manager that removes
notification-daemon for xubuntu-desktop hence preventing ubuntu-desktop to
upgrade.
If xubuntu-desktop is your main desktop environment you can remove notify-osd
before upgrading
If ubuntu-desktop is your main desktop environment removing xubuntu-desktop
should fix it, but in this case be careful to the packages that will be removed
before accepting the upgrade.
I'm setting to triage/medium and adding a task for xubuntu-meta.
** Changed in: update-manager (Ubuntu)
Importance: Undecided => Medium
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Triaged
** Also affects: xubuntu-meta (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xubuntu-meta (Ubuntu)
Status: New => Triaged
** Changed in: xubuntu-meta (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/775411
Title:
Unable to upgrade to 11.04 when both ubuntu-desktop and xubuntu-
desktop are installed: conflict on notification-daemon
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