This was tricky but I finally got a successful boot (following several failed boots) using gdm3 by selecting the kernel with "e" from grub and then removing 'quiet splash'. So I hope this is more helpful.
** Attachment added: "prevboot.txt" https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1824588/+attachment/5256203/+files/prevboot.txt -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1824588 Title: Ubuntu Disco boots to or logs out to black screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1824588/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs