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