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
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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
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