I used my Ubuntu Desktop yesterday as usual, but now I can't boot in because the screen keeps flickering to a black screen and a verbose boot screen where I see no failure or errors. I can ALT-F2 and see the login, but it stills flickers so I can't type correctly my password. I didn't install anything particular, I've searched a little and people talk about NVIDIA drivers, but I didn't install anything like this yesterday, what can I do?

Thanks for helping.

dpkg -l *nvidia* | grep ii returns

 nvidia-375               375.66-0ubuntu0.16.04.1
 nvidia-opencl-icd-375    375.66-0ubuntu0.16.04.1
 nvidia-prime             0.8.2
 nvidia-settings          361.42-0ubuntu1
  • is it the computer causing the problem or Ubuntu? – Camden Jul 19 '17 at 14:09
  • Ubuntu, I have a dual-boot, Windows works just fine. – Drakota Jul 19 '17 at 14:10
  • 1
    try to ssh login to it and see what happens – Camden Jul 19 '17 at 14:10
  • can you log in? – Camden Jul 19 '17 at 14:14
  • No, I can't it flickers infinitely – Drakota Jul 19 '17 at 14:15
  1. Uninstall the Windows driver that allows you to read/write to Ubuntu EXT4 partitions.

  2. To check the file system on your Ubuntu partition...

    • boot to the GRUB menu
    • choose Advanced Options
    • choose Recovery mode
    • choose Root access
    • at the # prompt, type sudo fsck -f /
    • repeat the fsck command if there were errors
    • type reboot

Update #1:

  • boot to the GRUB menu
  • select Ubuntu
  • hit the e key
  • use arrow keys to move
  • find the line that has "quiet splash"
  • add nomodeset, so "quiet splash nomodeset"
  • hit F10 to exit and continue boot
  • see if it flickers
  • I don't think this is it, I had the same problem before installing the driver to read my Linux partition, I installed it like 10 min ago to get some files onto my Windows partition. – Drakota Jul 19 '17 at 14:42
  • @Drakota did you perform the fsck? – heynnema Jul 19 '17 at 14:50
  • Yes and I didn't get any error messages and I still get the flickering. – Drakota Jul 19 '17 at 14:51
  • Did it flicker when you did the fsck? Do you have Nvidia? – heynnema Jul 19 '17 at 14:54
  • No, I didn't get any flickering. – Drakota Jul 19 '17 at 14:55

I installed bumblebee-nvidia in a terminal session and was able to login. Still haven't figured what happened in the first place, but at least it works for now. Thanks for the help everyone.

  • For what it's worth, I installed bumblebee just now, rebooted and there was no blinking display. It had just started to do that a few updates ago, so I have no idea which one caused it as I often put the computer to sleep at night. – Christopher Apr 16 '18 at 13:59

I recently had the blinking screen on a dual boot Ubuntu 18 and Windows 10 machine and the boot sequence seemed to be stuck. When I tried CTRL+ALT+DEL a message was displayed that unattended updates was in progress. At some point the blinking stopped and a finished message appeared. The machine rebooted, and everything was normal after that.

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