I had an error when booting up Ubuntu that read, "Oh no something has gone wrong. A problem has occurred and the system can't recover Ubuntu". The last command I remember running before rebooting Ubuntu was sudo apt-get autoremove to remove unnecessary dependencies. I looked up several solutions until I found on the dev.to website
All I had to do was reinstall Ubuntu Desktop with the command sudo apt reinstall ubuntu-desktop. It seems some critical packages were deleted.
Originally, I wanted to comment on this as an answer to this question but I do not have enough reputation points.
Could someone explain why the command sudo apt-get autoremove would remove critical packages (I also lost some snap packages I use such as Discord)?