grub error 17, but 'sudo grub' = command not found
I have a guy in my office who was using an old version of ubuntu and he tried upgrading to 10 but now he's getting grub error 17. I Google this and everyone suggests reinstalling grub starting with opening a shell and typing 'sudo grub'. However, I get 'command not found' in response to that. I've tried looking for the location of grub so I could try 'sudo /sbin/grub' and such, but I don't see it anywhere.
Also, I'm using a version 9.10 Live CD at the moment because I can't find out how to disable the drmraid option on the version 10 CD (necessary to detect the hard drives which, although they are on a raid controller are not configured as an array but separate drives).
Any ideas short of starting over from scratch?