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I'm having an issue and I hope someone can help me,

I installed ubuntu 12.10 on my computer (along side windows 7) from a live cd, but when I rebooted my computer after a succefull installation, I get grub prompt, when I type boot in it, it prints "Error 8: Kernel must be loaded before booting".

So I searched and I found this link : Loading Ubuntu From Grub, but when I type linux /vmlinuz root=/dev/sda5 I get this message "Warning! No such command: linux"

Does anybody have any idea about what I should do ?

Note that I reinstalled ubuntu but still get the same issue, and that this is not my first time installing ubuntu (I installed a lot of versions a dozen of times before and this is the first time I face this issue).

When I type : kernel /vmlinuz root=/dev/sda5 instead of : linux /vmlinuz root=/dev/sda5 I get Error 15: File not found (I also tried sda4 since find /vmlinuz is printing hd(0,4))

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Have you tried booting from a livecd, chrooting into your ubuntu partition(s), and manually running '# grub-mkconfig -o /boot/grub/grub.cfg'?

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Thank you for your answer, When I do as you said, I get this error : /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). – Oussama Oct 30 '12 at 17:09
You did not chroot into your ubuntu partition correctly. First create a directory in /media (e.g # mkdir /media/ubu). Then mount your ubuntu / partition into that directory (e.g # mount /dev/sda1 /media/ubu note that this example depends on which partition is mounted as / in ubuntu). Then # chroot /media/ubu. At this point, the grub command should work. – astex Oct 30 '12 at 19:25

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