Update GRUB to reflect changed partition location

Posted by soandos on Ask Ubuntu See other posts from Ask Ubuntu or by soandos
Published on 2012-06-22T02:31:04Z Indexed on 2012/06/22 3:24 UTC
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grub2

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gparted

I currently have 3 partitions: Windows, Ubuntu, and swap.

I want to move my windows partition by about 20GB. When I try to do this in GParted, it tells me that this will mess up GRUB, and that there is a page that can resolve these issues.

However, this page does not actually mention my issue. I am not moving my boot partition (Ubuntu).

How can I force GRUB to look for operating systems that are on the drive? I know that this is possible, because when Ubuntu was installed it found Windows without any issues.

Additionally, if I create a copy of a partition, how can I add that to GRUB (I assume it will be the same command as above, but if not, what would it be)?

Note: OS prober is mentioned here but it doest not list how to use it, or where to find it.

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