I had a nVidia Geforce 6200 128mb AGP Vga card before and ubuntu was working fine and I had customized my Grub boot menu background, Today I installed a new graphics card which is same as above but it is 256MB, now the graphics of the grub menu is lowered (low resolution and color depth), what should I do to fix it?
Determine Resolution to Use
First determine the video resolution you are able to use. Go to the grub menu and enter
and copy down the resolution you want to use. I suggest that you use the preferred mode listed at the end, if any.
You could also use
will list your resolutions and highlight the one you are using.
Alter Grub Configuration
In the video Cako found yooyoomine suggests the following steps:
Look for the line containing
Edit the line, removing the initial "#" so it is no longer a comment, and change the resolution to the one you picked above. Save the file when done.
search for the following fragment (about half way down the file):
Where the line is enter the line:
and save this file.
Then boot and test. If this disallows the normal use of grub you will have to either boot without seeing the menu, or use an Ubuntu Live CD, to unmake the changes.
This cause is for the bad nvidia driver.I had the same problem before saw this video: Video