It appears you are using unsupported graphics driver packages from a PPA: LP-PPA-oibaf-graphics-drivers
Please remove the PPA from your system using the 'ppa-purge' command and see if the problem persists. If it does then please open a new bug by then running: ubuntu-bug gnome-shell ** Tags added: radeon ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1786647 Title: Unable to boot Ubuntu 18.04.1 without radeon.dpm set to 0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1786647/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp