Is it just the login screen that's black or the whole boot process? If you can, please boot in recovery mode and then run:
apport-collect 1908373 journalctl -b-1 > prevboot.txt and attach the resulting text file here. ** Package changed: gnome-shell-extension-ubuntu-dock (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete ** Package changed: ubuntu => gnome-shell (Ubuntu) ** Tags added: focal -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell-extension-ubuntu-dock in Ubuntu. https://bugs.launchpad.net/bugs/1908373 Title: [Seal MT][Caribou]20.04 X59,Black screen appears when installing Ubuntu on AMD 540 graphics card and CML CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1908373/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs