I had the same problem. The only difference is that my disk is not encrypted. What solved the problem for me was to get to the grub menu. (If it doesn't come up by itself, which mine does, I read you can press and hold the shift key as it's booting up.) Choose advanced options. Select recovery mode. Then a popup appears where I select resume. Then select ok. I could then get into my account but the screen resolution is messed up a bit.
I log in to my account. Once logged in I type in a terminal.
Code:
sudo gedit /etc/gdm3/custom.conf
Enter my password. Uncomment the line #WaylandEnable=false by just deleting the # sign. Save. Reboot. And that solved the problem for me.
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