Grub has gone completely insane on me. My quad-boot system was working great up until I upgraded Ubuntu to 12.04. Since Ubuntu overwrote the Grub stuff I had to repair it with my Mac OS X and FreeBSD entries. After this, trying to boot Mac OS X gave me the error "couldn't open file" and FreeBSD gave the error "no such partition". Windows and Ubuntu worked fine.
So I tried repairing again because I figured something must've gone wrong in the install process. Then only Ubuntu would boot. Trying to boot Windows would give me the error "no argument specified".
I tried repairing Grub once again, since I seemed to be getting different results each time. This time, Ubuntu no longer appeared in the Grub menu, and the errors for the other OSes were the same.
So I booted into the Ubuntu 12.04 live CD and ran Boot-Repair with recommended settings. Now Grub is completely skipped and Windows boots up.
I have absolutely no idea what is going on or why I get different results every time I reinstall Grub. Here is how my partitions are set up:
- sda1 - Storage drive,
- sdb1 - Windows,
- sdb2 - Mac OS X,
- sdb3 - FreeBSD,
- sdb4 - Extended,
- sdb5 - Ubuntu,
- sdb6 - Shared storage,
- sdb7 - Shared Storage,
Here's my grub.cfg file: grub.cfg