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I have installed windows a 7 and Ubuntu 13.04 already, I was trying to install backtrack but at the start of the installation, I turned the computer off because it told me it was going to boot automatically or something like this, then when I tried to open my computer again, I got this

error: unknown file system.
grub rescue>
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  • Backtrack is old and unsupported, you should instead use Kali. Try to recover your GRUB with Ubuntu then install something actual.
    – Braiam
    Oct 19, 2013 at 0:54
  • The solution is this answer: askubuntu.com/a/182863/6005
    – jrg
    Oct 19, 2013 at 2:24

1 Answer 1

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Place ubuntu on a USB Live, boot from it and do the following:

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

Then

sudo apt-get install -y boot-repair && (boot-repair &)

Do the recommended repair and then reboot.

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  • NYTHING WILL BE DELETED?
    – karim
    Oct 18, 2013 at 12:17
  • and should i boot the ubuntu or can i just choose try ubuntu
    – karim
    Oct 18, 2013 at 12:18
  • Nothing is deleted. Just select "Try ubuntu" and after booting into the live usb, open terminal and to the above steps.
    – Simion Agavriloaei
    Jan 3, 2014 at 12:53

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