Recently I started a habit of cloning my personal Linux installation instead of installing it clean because I don't wanna spend a time of setting my whole workspace, again and again. However this solution results in an unwanted drawback of having everything the same on two machines (surprising, I know).
When I started to use the KDE Connect app I encountered issues with it because 3 machines had the same key and it didn't work properly. Then I started to think about a list of things that should be changed/regenerated after cloning Linux installation. Just to make it clear - none of the things beside KDE Connect that I describe here are needed for the system to work. I never experienced any other issues related to running three machines with the exact cloned OS but I wanted to do it to mitigate any possible problems that may arise in the future.
Note: Before removing any files, you may do a backup of them in case something goes