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I was dual-booting Ubuntu (10.10) and Windows 7. I installed Backtrack in addition to these 2, and the Ubuntu GRUB was replaced with the one from Backtrack.

Now when I boot, only Backtrack and Windows 7 are listed in GRUB. When I run fdisk from Backtrack, I see all partitions, and running a Partition Manager lists the Ubuntu partition as a Linux partition. However, the partition manager says that it is unable to read the contents of the partition, and that it is unable to re-read the partition table.

Any ideas? Thanks in advance.

Also, the Ubuntu, Backtrack, and Linux Swap partition are all listed under the same Extended partition.

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Off topic: Should probably be on superuser or askubuntu. – hammar May 9 '11 at 21:47
this should be on SuperUser.com – gruntled May 9 '11 at 21:48
Do you use the partition manager to mount the partition? What is it saying exactly? – Tobu May 9 '11 at 22:11
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migrated from stackoverflow.com May 9 '11 at 22:01

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2 Answers

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So you have 3 operating systems installed? And Win7 and Backtrack are accessible from the GRUB menu (and they can be booted into)?

If that's the case, try running grub-update from Backtrack (as the root user or with sudo) and it should rescan everything and correctly update GRUB.

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Or you could revert back to the ubuntu grub by booting into the live cd and reinstalling it(grub). – a sandwhich May 10 '11 at 1:30
@a sandwhich, yes, but I would do it with a system that already has access to the necessary devices and then you wouldn't have to do that nasty chroot and rebinding stuff. – Nitrodist May 10 '11 at 4:19
Is it necessary to have to do the chroot and rebinding? Last time I reverted to ubuntus grub from fedora I didn't have to do any of that. – a sandwhich May 10 '11 at 11:44
@a sandwhich ubuntuforums.org/showthread.php?t=224351 and there's other guides I know. – Nitrodist May 10 '11 at 13:30
Yes, I remember seeing that tutorial, I worked through some of it, and then switched to another. Most of the ones I found did use chroot. – a sandwhich May 10 '11 at 15:14
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Ok I finally got it working again -- just had to reinstall grub2 from a live cd. Thanks everyone.

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