As suggest: -downgrade ppa's packages to genuine version - un-pin 'unity' (The package 'unity' is marked for removal but it is in the removal blacklist) -deactivate ppas
Then 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/1768561 Title: Update to Ubuntu 18.04 LTS fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1768561/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs