I just wanted to state that this issue seems to have resolved itself. I've grabbed the updated packages from apt and these are what I believe the relevant updates were. Is there any more information that might be more useful?
Start-Date: 2018-07-10 18:20:32 libwayland-egl1-mesa:amd64 (18.0.0~rc5-1ubuntu1, 18.0.5-0ubuntu0~18.04.1) 2018-07-19 21:31:00 gdm3:amd64 (3.28.2-0ubuntu1.2, 3.28.2-0ubuntu1.3) gir1.2-gdm-1.0:amd64 (3.28.2-0ubuntu1.2, 3.28.2-0ubuntu1.3) libgdm1:amd64 (3.28.2-0ubuntu1.2, 3.28.2-0ubuntu1.3) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1760201 Title: ubuntu 18.04 GDM - missing icons and letters on login screen with nouveau + Wayland To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1760201/+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