Also can’t type any keys to do as they suggested
If you haven’t set a root password you can’t login, but you can boot a Live USB installer and use journalctl in a terminal to view journal entries stored on the system drive. You can use the Live USB system to check that the system drve is healthy and has free space.
If you aren’t familiar with journalctl, spend some time with introductory tutorials. You will need to mount the system drive, find the directory where the journal is stored, and use the option:
-D DIR, --directory=DIR
Takes a directory path as argument. If specified, journalctl will operate
on the specified journal
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