Im using clean install of Kubuntu 16.04 for 2 days, but today after login screen (SDDM) I got black screen, I can only use TTY. So everything looks like normal till login screen, after I click login my monitor turns black and I can only use TTY. I didn't install any drivers.
deleting .config and .cache folders
sudo startxfrom TTY and I got an error:
timeout in locking authority file /home/tomsk/.Xauthorityand after that black screen shows in that current TTY (so I lost a terminal)
But none of that helped.
I tried to login with iGPU and GPU (NVIDIA) too but with no results.