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I had an electricity cut while I was upgrading from Ubuntu 10.10 to 11.04, now when booting the system I get the following message:

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Any ideas how to solve this?

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At the grub boot menu if you type e to edit the grub configuration for the line you've selected you'll see a line something like this:

linux /boot/vmlinuz-3.0.0-12-generic root=UUID=ddbfffc1-731c-4931-9129-75c5f42f8ecb ro single nomodeset

The culprit is the root=UUID=ddbfffc1-731c-4931-9129-75c5f42f8ecb part which probably still has the old UUID or partition listed. If you know the specific partition you can either set it to something like root=/dev/sda1 (or whatever your partition number is) and then type ctrl-x to boot or you can substitute the correct UUID which you can find by booting with a rescue disk and running the blkid command.

If you're lucky and your root partition has been properly labeled then you could also try root=LABEL=/.

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this goes after grub? if yes - you can change yours grub settings for hd and init=/bin/sh and run something like fsck

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Can you explain more? as a start it says: The disk drive / is not ready yet or not present, but when i go to console, I can access all files – khelll Apr 29 '11 at 13:53
how you access that files? you can try to check blkid /etc/mtab and grub configuration if UIDS are correct. – MealstroM Apr 29 '11 at 13:57
I went with the recovery mode and it said it can't mount drives then it gave me the console. Using it I can access files with no problems. Not sure what to do with the commands u specified above. – khelll Apr 29 '11 at 14:08
can you show yours /boot/grub/grub.cfg and command /sbin/blkid result? – MealstroM Apr 30 '11 at 12:35

I had this problem once, way back with... I think it was Ubuntu 7. The Disk UUID's changed, I can't remember why.

I mounted manually, edited /etc/fstab and replaced the UUID entries with actual partitions (eg: /dev/sda1, /dev/sda2 and so on) and rebooted.

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I am sorry to say that I have the same problem. But, unfortunately, comment from Some Guy couldn't help me because the UUID value in fstab actually matches the output of blkid. BTW I tried to use /dev/sda1 instead of the uuid, but it didn't help. – user79943 Apr 29 '11 at 22:07

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