Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

After the update I have absolutely no problem with Linux, but Grub doesn't let me start Windows any more. (Entry is there but I only get the flashing hyphen and nothing else happens)

Can I safely run "update grub" without damage to the Ubuntu installation?

share|improve this question

sudo update-grub will do the job I guess. :) (In a nutshell, yes you can. >.>)
Corrected the 'update grub' line in my answer ... thanks Quack.

share|improve this answer
no need for the 2, sudo update-grub will do fine. all this does is regenerate the /boot/grub/grub.cfg – quack quixote May 6 '10 at 17:50
ha! they are different commands. update-grub is a shellscript that execs grub-mkconfig -o /boot/grub/grub.cfg "$@" -- can you guess what update-grub2 execs? update-grub "$@" !! so yeah, no need for the 2. – quack quixote May 6 '10 at 17:52

You have been hit by Bug #570765 , which is quite common for 10.04 adopters running Windows.

Loading the latest updates and rebooting will fix it.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.