Because disabling these ppas don't remove the packages installed. In this case, oibaf ppa had newer packages as per version numbering than 17.04 in such a way that apt was unable to resolve valid dependencies.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1683702 Title: Cannot upgrade from 16.10 to 17.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1683702/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
