Fixing GRUB error: unknown filesystem, grub rescue

Posted: September 17, 2011 in Linux, Technology

If you have dual boot system ubuntu and windows and you get this error unknown filesystem you would want to recover your windows first priority. You need to start your computer with extranal Ubuntu live CD or USB (if not sure ask I can explain how to create one).

once you run ubuntu then you need to open commandline (Ctrl+Shift + t) you need to be root to access root type:

sudo su

Then type following commands successively

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update && sudo apt-get install -y boot-repair && boot-repair

Once done will open the boot-repair windows with two options choose the first option ( need to be patient it will take time).Restart computer without the CD or USB and see if it fixes the problem if not then run you live ubuntu again and type’gksu boot-repair’ in the commandline. It will popup the window again and choose the second option. Restart and see if it fixes the problem if not follow the link here for further help.

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Comments
  1. Sem Sinatra says:

    Thanks!!! Saved my bacon.

  2. Scott Brewster says:

    Thank you, but BackTrack 5 R2 didn’t like the second line. You need to remove the -y after install. It worked like a charm after that.

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