I'd just installed ubuntu 20.04 and after 1 day it's stuck at black screen after booting. An underscore is blinking on the top corner ...
There are many solutions regarding ubuntu 16, 18 but I'm new in ubuntu 20 Is there any change?
Please try to switch to a terminal by pressing together [Ctrl], [Alt] and [F1]. If this is working, then there should be a login screen where you can login with your username and password. From thereon you can try to gather some informations.
One good source is the systemlog:
journalctl -xe