There seems to be several places to look. I will have to continue later as I have run out of time for now. But maybe the attached file will help narrow down the location of any useful files related to dkms.
** Attachment added: "locate_i_dkms.txt" https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1777378/+attachment/5153868/+files/locate_i_dkms.txt -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1777378 Title: GDM no longer presents GUI login Ubuntu 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1777378/+subscriptions -- desktop-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/desktop-bugs