Un-install Grub-pc in mint and then re-install. It will give you the 
option where to install it.

If you get an error message that grub-gfxpayload can't install update 
sources and it will install.

Kevin

On 22/10/11 09:39, Roger Searle wrote:
> Hi, I'm running Linux Mint 11, a second OS install on this box, the
> first being various k/ubuntus ending at Natty.  I'm not interested in
> the Natty install now and want to make use of the partition for
> something else, however this is where the "working grub" is installed.
> There is a "second grub" (/etc/default/grub, /etc/grub.d/) for the Mint
> install, however editing of this /etc/default/grub and running
> grub-update have no effect on the grub menu when the machine boots,
> leading me to realise I have "2 grubs".  I've done enough googling to
> get me this far and realise I don't really know what I should do to have
> the box use the grub files in the Mint install, the likely outcome would
> be rendering it unbootable and needing to reinstall grub.  Could someone
> point me in the right direction please?
>
> Some more info that's probably relevant: sda6 is where the Natty
> installation is, sdc1 is / and sdc6 is /home for Mint.  The single
> partition on sdb (sdb1) is my /video, the fact that it has the bootable
> flag set may be a hangover from a previous install.  And of note, sdc1
> does not have the boot flag set.
>
> roger@gemini ~ $ sudo fdisk -l
>
> Disk /dev/sda: 250.1 GB, 250059350016 bytes
> 255 heads, 63 sectors/track, 30401 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x0003330c
>
>      Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *       30159       30401     1951897+  82  Linux swap / Solaris
> /dev/sda4               1       30158   242244073    5  Extended
> /dev/sda5               1       25294   203173992   83  Linux
> /dev/sda6           25295       30158    39070048+  83  Linux
>
> Partition table entries are not in disk order
>
> Disk /dev/sdb: 320.1 GB, 320072933376 bytes
> 255 heads, 63 sectors/track, 38913 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x00054fc7
>
>      Device Boot      Start         End      Blocks   Id  System
> /dev/sdb1   *           1       38914   312568832   83  Linux
>
> Disk /dev/sdc: 320.1 GB, 320072933376 bytes
> 255 heads, 63 sectors/track, 38913 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x000785a6
>
>      Device Boot      Start         End      Blocks   Id  System
> /dev/sdc1               1        3892    31255552   83  Linux
> /dev/sdc2            3892       38914   281313281    5  Extended
> /dev/sdc5            3892        4872     7875584   82  Linux swap / Solaris
> /dev/sdc6            4872       38914   273436672   83  Linux
>
>
> Cheers,
> Roger
>
>
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