Thanks for your report. Please revert Xorg packages from oibaf repository to official Ubuntu versions and try the upgrade again.
I'm closing this report because it is not a bug with Ubuntu. Don't hesitate to submit any bug you may find. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771561 Title: I am unable to upgrade my system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1771561/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs