Trouble upgrading kernel from 511 to 515

Sure… :face_with_peeking_eye: :arrow_down:

Reinstalling would be the easiest method to solve that problem for newbie.

Anyway all mentioned kernels are no longer part of the repo:

They are stable ones and go EOL (end of life) after about 3 months.

About the “conflicting files” issue. You need to overwrite them with the latest files:

sudo pacman-mirrors --geoip
sudo pacman-mirrors --fasttrack
sudo pacman -Syyuu --overwrite "*"

No, but if it is no longer available in the repo then it will be removed on an upgrade. So that a signal that you didn’t update for decades. Possibly an outdated mirror.

Also if you encounter the gpg verification problem, look here: