UPDATE As for now, I am 100% the issue is my mouse. I connected another mouse and everything works just fine.
Here is the mouse I am using that doesn't work: https://www.amazon.com/Mad-Catz-Optical-Gaming-Mouse/dp/B00A72ZQK0
Any idea on how to fix this hardware issue?
I am fairly new to the Linux world and installed Ubuntu.
My issue was, that clicking on popups did not work and most of the times the whole UI was not clickable. Strangely, while the UI was frozen, Websites in Firefox worked fine and I could use keyboard shortcuts like
TAB without a problem. (Also the mouse cursor is movable and sounds play)
But I was basically unable to perform anything without encountering items I couldn't interact with or a complete freeze.
That's when I decided to install Linux Mint with the hope of getting rid of those problems. But against my hopes nothing changed. Same issues.
I figured out, that by unplugging and inplugging my mouse, the system works fine again, until after a few seconds or after I clicked some buttons, the UI is frozen again.
I am really frustrated now but don't want to switch back to Windows. I hope there someone who can help me with this.
Here are my system specs:
P.S.: I ran Ubuntu 18.04 LTS and now I am running Linux 19 Cinamon