0

I have just installed Ubuntu 18.04 on a laptop and it worked perfectly. After installing it on another one (Asus RoG, i7, Nvidia GTX 950M, 16gb RAM), everything worked so poorly.

How it manifests: Whenever I want to drag a window with my mouse, or to write something, or to select an area on the screen, the rendering is so slow.

black screen

EDIT1: After doing what pilot6 pointed out, I managed to go past the slowness, but got stuck in an infinite loop at the login screen. Heynnema tried to help me out, but my .Xauthority file was missing.

EDIT2: In the end I gave up and reinstalled it again, but this time I chose something else instead of 'nomodeset' (noapic, nolapic, acpi=off), after some research. That fixed my problem.

karel
  • 110,292
  • 102
  • 269
  • 299
OldDew
  • 3
  • 4
  • Comments are not for extended discussion; this conversation has been [moved to chat](https://chat.stackexchange.com/rooms/90478/discussion-on-question-by-olddew-ubuntu-18-04-is-very-slow-on-high-end-laptop). – Mitch Mar 02 '19 at 06:54
  • 1
    Possible duplicate of [Ubuntu 18.04 is too slow on my Asus r558ur](https://askubuntu.com/questions/1122290/ubuntu-18-04-is-too-slow-on-my-asus-r558ur) – Pilot6 Mar 03 '19 at 14:25

1 Answers1

1

Your initial problem of video slowness is caused by your Nvidia drivers needing reinstallation, and the removal of nomodeset in your /etc/default/grub.

Now, we clear up your login problem. If you've been starting graphic applications from the terminal using sudo, that's what probably caused your problem. Always use sudo -H.

  • boot to the GRUB menu
  • choose Advanced Options
  • choose Recovery mode
  • choose Root access
  • at the # prompt, type:
    • sudo mount -o remount,rw / # remount the disk as rw
    • cd /home/your_username # change directory
    • ls -al .*thority* # list some files

You should see something like this...

-rw------- 1 your_username your_username 407910 Nov  2 08:56 .ICEauthority
-rw------- 1 your_username your_username     58 Jun 23  2017 .Xauthority

If it DOES NOT show -rw------- then...

  • sudo chmod 600 .*thority* # change file protection

If it DOES SHOW root root then...

  • sudo chown your_username:your_username .*thority* # change file ownership

  • reboot # reboot the computer

Reboot and see if you can log in.

heynnema
  • 68,647
  • 15
  • 124
  • 180
  • Thank you for your answer, but after I write the "ls -al .*thority*" command, I don't see .Xauthority. I only see .ICEauthority. As a result, the other commands do not help me. – OldDew Mar 02 '19 at 08:25
  • @OldDew is .ICEauthority owned by root:root, or by you? If root:root, then the other commands will still work for you. – heynnema Mar 02 '19 at 12:43
  • Sorry for the long wait. In the end I gave up and reinstalled it again, but this time I chose something else instead of 'nomodeset' (noapic, nolapic, acpi=off), after some research. That fixed my problem. The install went smoothly and I never had those problems again. The problem would have been fixed by this answer if I had the .Xauthority file. – OldDew Mar 03 '19 at 19:47
  • @OldDew but... by setting **noapic, nolapic, acpi=off**, you've partially crippled your computer. – heynnema Mar 03 '19 at 20:16
  • That was the only way I could work around it. After installing it, I've changed them back to normal and now everything seems fine. – OldDew Mar 03 '19 at 20:19