1. I have a system that is configured as follow:
- sda1 Win 7
- sdb1 Ubuntu 12.0 (Grub2)
- sdc1 Win XP pro
- sdb5 Mint 12.0 (another Grub2)
2. The Ubuntu 12.0 and Mint 12.0 OS’s were installed with only one hard drive installed at a time and, thus I have separate Grub2’s.
3. I modified the Grub’s to be identical, containing Ubuntu and Mint in their menus.
4. I am accessing the systems remotely and switching between Linux OS's by using
“grub-reboot 0” or “grub-reboot 5” and
5. Unfortunately, the “update-grub” only updates the grub from the currently running OS. However, when I boot the grub from Ubuntu runs.
Can I point to which Grub to update? Or, can I get rid of one Grub and only use one for both, including the update-grub function?
You should manage grub from one of the OS's you have installed. You can choose which one.
See http://crunchbanglinux.org/forums/post/176582/#p176582 for more info.