I am on Kubuntu 20.04LTS. KDE Plasma 5.18.5
Today, I found that the mouse cursor moves but cannot click at all. Sometimes the wheel works (exchange desktops) but sometimes it doesn't. Sometimes the mouse cursor is constantly shown as I
beam style, sometimes it changes to arrow style and I
beam style depending on where it is. Selecting on the Desktop by dragging the mouse never works. The keyboard always works.
After entering virtual desktop by Ctrl+Alt+F3 and exiting by Ctrl+Alt+F1, the mouse click starts working. But I have to perform Ctrl+Alt+F3 and then Ctrl+Alt+F1 every time after booting my Kubuntu.
I removed virtualbox-6.1
and checked if the issue got fixed, but that didn't fix it.
Is there anything I can do to fix the issue?
So far I found nothing to resolve the issue.
But once happening the issue,
Currently everytime when mouse click lost, I do above.
Not really an answer, but another workaround... For me on ubuntustudio 20.04 I have to Ctrl-Alt-F1 to go to a console, then login and 'sudo pkill lightdm' to kill the display manager, then Ctrl-Alt-F7 to switch back to the GUI and login again. Of course that kills all my windows, but the mouse click is restored.