The upgrader does not support unknow version from third party (ppa packages are logged as broken).
Use 'ppa-purge' for each ppa, to downgrade to genuine ubuntu version, then check none of these ppas are active. Next step is to clean the system via 'gtkorphan' & 'bleachbit' (as root, carefully select options) After rebooting the dist-upgrade script should be happier. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770504 Title: Error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1770504/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs