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On my computer, I replaced windows XP with Ubuntu 11.04. When I start up my computer, I get the message 'Can not display this video mode - optimal resolution 1280 60Hz', in a black screen. After a few minutes, I can login. After this, there appears a colored screen with only a mouse cursus, and I can't do any more!

How can I solve this problem?

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This sounds similar to a problem I have with my desktop. Perhaps you can try looking at some of the answers there. – Christopher Kyle Horton Sep 8 '11 at 1:21

This is a message from your monitor, not your computer. Open /etc/default/grub with gedit (root privileges required) and set GRUB_GFXMODE to 1280x800 (or 1280x1024 it's not widescreen), and save the file. After that, open a terminal and run update-grub2 with root privileges.

So, in a nutshell:

  1. gksu gedit /etc/default/grub
  2. Replace GRUB_GFXMODE=640x480 (or whatever resolution is default, I don't remember exactly) by GRUB_GFXMODE=1280x800 (or GRUB_GFXMODE=1280x1024 if it's not widescreen).
  3. Save the file.
  4. Open a terminal and run sudo update-grub2.
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