I was incorrect: should be "/etc/default/grub", not "/boot/default/grub".
I did run "sudo update-grub" after the edit.
Because the lines became so bad on my laptop running 10.04, I've done a clean install of 12.04: no vertical lines. I quickly concluded that I hate Unity. So I checked out MATE & Cinnamon. I've settled on MATE. This has made me decide that I'll upgrade on my Desktop to 12.04 with MATE after July, when 12.04.1 is released.
Chris,
I was incorrect: should be "/etc/default/ grub", not "/boot/ default/ grub".
I did run "sudo update-grub" after the edit.
Because the lines became so bad on my laptop running 10.04, I've done a clean install of 12.04: no vertical lines. I quickly concluded that I hate Unity. So I checked out MATE & Cinnamon. I've settled on MATE. This has made me decide that I'll upgrade on my Desktop to 12.04 with MATE after July, when 12.04.1 is released.