One of the ways to be sure this doesn't happen would be to force a purge of everything that has been installed from third-party repositories, do a clean upgrade, and re-install any pruged packages from the Debian repos. With some big What-Ifs remaining when said packages happen to e.g. not be available.
This could be a bug of, or likely rather a change to, the Ubuntu upgrade policy (as in "people involved in Ubuntu decide how such cases are to be handled in general), but I am not familiar with the current policy at all. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1820088 Title: GIMP doesn't start in disco dev To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1820088/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs