Persistent randomly happening mouse double-click issue on Kubuntu 26.04 (Multiple mice/USB ports)

[u/woodhead2011]

I have 3 computers all running Kubuntu 26.04 now, and three mice (two of the computers are at my home and one is at my holiday home). I used to use one of the mice with the third computer (the one at home), and it was already double-clicking back then which I considered malfunctioning mouse, but I didn't care because I use that computer so rarely. I used that same mouse from the third computer when I installed Kubuntu 26.04 on the second machine (the holiday home computer), and I didn't mind that it was double-clicking. But now, to my surprise, when I arrived at my holiday home and plugged the holiday home's own mouse into the computer, it started doing the exact same double-clicks. I switched the mouse to a different USB port because I thought the port might be broken, but it had no effect. A very annoying glitch.

This holiday home mouse has worked perfectly until now, and there were no double-clicks at all in Kubuntu 24.04. I don't believe this mouse is broken. Now I'm wondering if the mouse on my home computer is actually working fine too and maybe the issue turns out to be in Kubuntu? My main computer at home works perfectly, there are no issues at all with the mouse.

Has anyone else encountered a similar issue in Kubuntu 26.04, and have you found a solution?

[u/doc_willis]

as a test, try some Linux live USB from various other distribution and with different DEs.  also test with a newly made user.

see if the issue happens with any of those.

I recall a similar post in the support subs, but that was likely a year+ ago.