I recently installed Xubuntu 18.04 for the first time, and a few days ago I noticed that my mouse is acting weird.
Every time I'm in the file manager, as well as some menus with tabs, the mouse scrolls up on its own. On some programs, like for example Arduino IDE, the mouse keeps left-clicking continuously on its own. On other programs though, like Firefox, and in my Windows 7 partition, everything works perfect. Though on Firefox there seems to be some sort of trouble as well, but only in certain pages.
This, as you can imagine, makes my Xubuntu partition nearly unusable.
It's NOT a hardware problem, since I tested multiple mice wired AND wireless on multiple USB ports and I tested the mice on other PCs. Hover click is grayed out so it's not it either. I tried resetting mouse options to default and changing the Double click time, it did nothing. I tried logging in as a new user, the problem persists. Disconnecting my Wacom tablet made no difference.
I asked in #xubuntu IRC, received a few suggestions, didn't help. I made a post at r/Xubuntu and opened a topic on Launchpad and on the Ubuntu forums, same result.
My mouse is Bluetooth (though I did try a wired one, as well as different USB ports), my PC is a desktop. I have Xubuntu 18.04 with Compton.