I have just installed the latest Ubuntu 10.4 first and then Linux Mint 8 with a new hard disk.

Both use Ext4 filing systems (specified by me) and Grub2.

I did asked the Mint installer to put Grub2 in the root partition sda13 but it failed apparently. This is quite common for Linux boot loaders so nothing to write home about.

When I manually boot Linux Mint, using the Grub2 prompt from Ubuntu, it refused to be chainloaded so I fired it up using the command
Code:
set root=(hd0,13)
configfile /boot/grub/grub.cfg
After I booted up Linux Mint I do into a "root" terminal and issued the command twice
Code:
grub-install /dev/sda13
just to make sure it did what it was told.

I then rebooted Mint, this time by manully chainloading it, and use it to do this reply.

I suppose Grub2 still has some holes in it.