Unfortunately, KDE is quantity over quality. I like the look and feel for the most part, but out of all the mainstream DEs, I’d say it’s the buggiest. GNOME with too many extensions is absolutely less stable, but vanilla KDE is embarrassing for stability, even on Linux Approved hardware.

It’s hard enough getting legit software in general to work on Linux. Even if a virus was written for Ubuntu, it is likely not going to run on Fedora, or Arch, or even downstream/upstream versions of Ubuntu.

Edit: Although thinking about it, Linux terminal commands are pretty universal, so if you manage to execute a script or terminal command as root or sudo then I guess it could apply to multiple distros.

Right-click on the applet (where you want to middle-click), select ‘Applet preferences’ -> ‘Configure’. Change the ‘Middle click action’.