We found that the Console mode of ubuntu 10.04 always switches to a default VGA mode (as if it was 640*480), and the following method does not work:
1. edit/etc/default/grub and add text to the quiet splash of the row grub_cmdline_linux_default.
2. Replace quiet splash with nomodeset noplymouth in the same line.
3. Remove the comment before grub_terminal = console
Failed to use all kinds of methods, suspected to be a service, searched for rcX. d/RCS. D was not found. I saw some posts from foreign forums very depressed about this problem and used the word "Killing Me.
Finally, find a superior solution on the ubuntuforums forum, which is simple:
Edit/etc/modprobe. d/blacklist-framebuffer.conf and add blacklist vga16fb at the end.
Although it is not the best strategy, it can only be used in this way.
Reference: http://ubuntuforums.org/showthread.php? T = 1484385