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i'm a fresh ubuntu user and I've installed a double boot with Wind 8 and Ubuntu 13.04, but since yesterday I'm receiving an error showing:

error: unknown filesystem grub rescue>

The fact is when I do ls (hdX,gptY)/ all I get is "error:unknown filesystem" again.

And the solutions posted don't work because I don't know why but I can't access the BIOS pressin F2 or to the boot pressing F12, the simply don't work since the error.

lhynre
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1 Answers1

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Get a live USB memory stick/CD etc. with Ubuntu and chroot into your system (more on that here: superuser.com/questions/111152/whats-the-proper-way-to-prepare-chroot-to-recover-a-broken-linux-installation). Then in the terminal which is chrooted into your system, type update-grub. Then close the terminal and re-boot to your hopefully-working GRUB!