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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