I'm an ultra nooby beginner with Linux and Kubuntu, so please be patient :) Since yesterday I've got a stupid problem. When I turn on my PC, and when my login screen shows up, after 2-3 second it crashes - I see everything in horizontal lines, but I can write my password and enter the system. Unfortunately, after login in, screen still looks like before login.

But when I'll log out with keyboard combo, the login screen look's normal. After second login everything is fine till I restart the PC. Then everything repeats. Additionally, since there is a problem with screen, I've also noticed that my spacebar often doesn't work when I press it, so I need to press it again. Didn't tried it with other keys.

I have no idea what is happening. Please help! :)

Now, when I log in the OS (after second time, when everything's fine), KDWallet want's me to enter password and log into it. Got this few times since yesterday.

  • What is your video card model? Mar 18, 2016 at 19:26
  • It's Asus Radeon R7 240 2 GB DDR3
    – user520326
    Mar 18, 2016 at 21:35
  • And what version of Ubuntu? Mar 18, 2016 at 21:35
  • Kubuntu 15.10. I'm using it for about 2 months now. Everything was fine till Wednesday. On Tuesday evening there were some updates, I've updated the OS and the next day this mess was here.
    – user520326
    Mar 18, 2016 at 21:41

3 Answers 3


This sounds it may be some hardware conflict. If you're able to login, then call up a terminal window or use keyboard shortcut Ctrl+Alt+t


sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

This is will update any library versions. Sometime this could help repair problems. This actually worked for me once. If this doesn't work then you may need to either check your hardware configuration on your computer to check that it is compatible with linux.

  • I tried it, the problem is still here
    – user520326
    Mar 18, 2016 at 21:37

Do you use SDDM display manager, version 0.13? If so, try

sudo apt-get install sddm=0.11.0-0ubuntu11

in order to force installation of the previous SDDM version 0.11 and reboot your system.


Maybe a graphics card issue or display manager issue. Try sudo dpkg-reconfigure <display manager> (change with kdm/lightdm, whichever you have), will help to solve if problem is with the display manager.

Hope it will help, thanks

  • I tried it and the answer was, that I don't have the manager installed
    – user520326
    Mar 18, 2016 at 21:42
  • Use commands: 'sudo apt-get update && sudo apt-get install kdm && sudo apt-get install -f -y'. Select kdm as default when prompted. Hope it helps, thanks Mar 19, 2016 at 7:30
  • This bug is still here.
    – user520326
    Mar 19, 2016 at 20:51
  • Probably it's a graphics card issue then. My knowledge is not able to solve it. Mar 20, 2016 at 10:37

You must log in to answer this question.