Today I ran into an odd issue: Since I didn’t have applet installed, I wanted to change my screen’s clarity with the keyboard shortcuts Fn+F4 and Fn+F5. Upon clicking, the system immediately slowed down and finally froze. I had to do a hard reset to have Budgie back.
All other Fn key combinations work normally, apparently. The Clarity-Applet works fine, though.
I am on a Dell Inspriron laptop, with Ubuntu Budgie 19.04 installed.
After the reboot use Menu - Logs - have a look around the logs to see if you can see anything being reported at the time you were using the keyboard shortcuts.
After a moment of pure despair and a little internet search on my mobile phone I managed to find way to open a root prompt from the recovery mode and purge the nvidia driver, what brought the system back …