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Old 03-07-2011, 01:27 PM   #1
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Exclamation Error on startup. Unknown file filesystem grub rescue>. What to do??

Yesterday I installed the latest version of ubuntu to my computer that was already running windows 7. I had everything working fine until in windows I deleted a partition that had nothing in it. After this I restarted but I can't get into either OS. I get an error that says
Error: unknown filesystem
grub rescue>

I think I need to fix something in grub. I have been booting off of a usb stick with linux on it in the mean time. I am very new to this and the things I find on the web don't make any sense to me. Can someone please help me??
Old 03-07-2011, 02:50 PM   #2
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You pretty much need to reinstall your bootloader and config. Go get the super grub disk and rescue it, and you should be good.
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Old 03-07-2011, 04:23 PM   #3
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You could boot from ubuntu live cd and then do this:

Boot up ubuntu from the livecd,open terminal and run:
sudo -i
mount /dev/sda7 /mnt
mount /dev/sda6 /mnt/boot #skip this one if not have a separate /boot partition
grub-install --root-directory=/mnt/ /dev/sda

If you miss “grub.cfg” file,use following to recreate:
mount --bind /proc /mnt/proc
mount --bind /dev /mnt/dev
mount --bind /sys /mnt/sys
chroot /mnt update-grub
umount /mnt/sys
umount /mnt/dev
umount /mnt/proc


dual boot, error, grub, startup

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