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I have been facing this since I changed my monitor from a CRT to LCD.

Ubuntu version: Ubuntu 9.04 kernel 2.6.28-11-generic

This is quite old machine, I am trying to access it after years - then I understood my monitor was not working - so I replaced it and then this issue started occurring.

There are two OS installed - Windows and Ubuntu. This error:

"Can not display this video mode optimum resolution 1024x768 60Hz"

occurs only for Ubuntu. Windows works perfectly fine.

I followed the following thread to resolve this issue : "Can not display this video mode" error during boot, followed by empty desktop

I faced some other difficulties while doing that as well:

  1. When I run gksu gedit /etc/default/grub, I get this error:

    gksu Gtk-WARNING **: cannot open display: :0

    I solved this by using vi (I also had to use sudo -H)

    sudo -H vi /etc/default/grub

    I observed that this was a new blank file and so I added

    GRUB_GFXMODE=640x480

    to it.

  2. After saving the file, when I tried to run sudo update-grub2 It said update-grub2 command not found. So I ran sudo update-grub and it worked fine.

I have tried these resolutions:

  • 640x480
  • 1024x768
  • 1280x800

None worked and I am still getting the same error.

Kartiki
  • 11

0 Answers0