Today I got an alert that I can upgrade my Ubuntu to 19.10. So I started the upgrade. After the Upgrade I restarted my PC. All went fine, but one program however was uninstalled. I installed it and restarted my computer. Now after decrypting my hard disk I can not log in to my user. It does an initial setup. Strg Alt T doesn't open the terminal. I can't do anything.
When I press arrow key up before decrypting my hard disk I see that it says "volume group Ubuntu-vg not found. Can not process volume group Ubuntu-vg."
How do I fix this? If possible I would like to do a backup of my data and then just do a fresh install. Is that possible?