# Problem statement The problem here is that
* Installed gnome-settings-daemon Depends: libcannbera-gtk3-0 * Installed libcanberra-gtk3-0t64 (= 0.30-10ubuntu10) Provides: libcanberra-gtk3-0 * Upgrade libcanberra-gtk3-0t64 (= 0.30-17ubuntu2) Depends: libcanberra-gtk3-0 i.e. we renamed libcanberra-gtk3-0 to libcanberra-gtk3-0t64 in noble and then back in plucky. The solver now resolves that by expanding gnome-settings-daemon Depends: libcannbera-gtk3-0 to gnome-settings-daemon Depends: libcanberra-gtk3-0t64 (= 0.30-10ubuntu1) | libcannbera-gtk3-0 (= new version) i.e. it prefers libcanberra-gtk3-0t64 because that is already installed. But since the new version dropped the Provides, only the old version is a valid solution. Now when visiting the dependencies, it sees that dependency, and solves it by picking the first choice, that is keeping the old version. # Solutions There are two solutions to this particular instance: (1) The upgrade for libcanberra-gtk3-0t64 is Section: olddlibs. We should not prefer oldlibs packages over other packages, that is, the dependency should have expanded to libcannbera-gtk3-0 (= new version) | libcanberra-gtk3-0t64 (= 0.30-10ubuntu1). (2) The more complex general case is disappeared provides: If the candidate lost the Provides that satisfied the dependency before, we should consider the old version to be an "obsolete Provider", that is, libcanberra-gtk3-0t64 is obsolete wrt providing libcannbera-gtk3-0. I have locally implemented solution (1), but it stands to reason that (2) should be implemented too. A test case can be constructed for (2) by taking the test case for (1) and changing the section from oldlibs to something "not obsolete". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2099966 Title: Failure: The 3.0 solver produced a worse result: libcanberra-gtk3-0t64 fails to upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/2099966/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
