Hi: After trying for hours to login to protonvpn using its app on ubuntu 20.04 (and not having internet access during that time) I decided to uninstall the protonvpn app, and start over. Big mistake.
I followed these instructions for uninstalling:
"1. Uninstall the official app. To uninstall the official app:
sudo apt-get autoremove protonvpn
Remove any leftover files:
rm -rf ~/.cache/protonvpn
rm -rf ~/.config/protonvpn"
Neither of the rm (remove) commands appeared to work: both received error messages -- the second of which was "permission denied."
So I added "sudo" before each command. After adding "sudo" to each rm command, there was no response to either command (just a new prompt), so they appeared to work.
However, afterward, I could no longer login to ubuntu. My ubuntu password was not recognized. (I think what I experienced was a "login loop" as described by others. When I entered my password after booting, the screen flashed, then returned to the login screen. I logged in again, same result.)
[My computer is a Lenovo T410, with Intel graphics. Not nVidia.]
I then tried to use recovery mode for two versions of ubuntu:
Linux 5.11.0-40-generic (recovery mode), and
Linux 5.11.0-38-generic (recovery mode)
Neither recovery worked. Both booted to brand new installs of ubuntu 20. While my ubuntu password now worked, when ubuntu opened, all my files were gone, and all my installed software was gone. (The screen read "Connect your online accounts," like a fresh install. There were no files.)
What happened? I was just trying to remove the protonvpn app which was preventing me from getting internet access. Instead, I ruined my whole installation and lost all my data.
I followed the protonvpn uninstall instructions, and lost everything. (Protonvpn support has not been helpful -- the representative said I must have "mistyped" the uninstall commands. I didn't.)
I would appreciate suggestions for recovering my ubuntu installation -- or just recovering my lost data. (How does uninstalling one app cause so much heartache?)
I hope I can get my data back. It must still be on my hard drive.