Here is a trick that can work in many different situations where you can’t get to your Ubuntu desktop. Basically, if your system is working, but you just can’t get into, this should do the trick.
A good example is a boot that fails due to something wrong with the login due to a faulty Plymouth splash theme – the system is fine, but you’re not given any way to log into it.
While I’ve used this trick to get out of many sticky situations, note it isn’t a panacaea to fix all boot problems. But hopefully in your case it does the trick, so you can get to your desktop to search for answers and fix the problem.
What you can try is reboot in Recovery Mode, enter your username and password at the command prompt, and then the command startx to get to your desktop.
Still couldn’t boot to your desktop? Try booting an earlier kernel from the GRUB boot menu.
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