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
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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
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