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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?

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2 Answers 2

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.

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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.

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