[ubuntu] no such partition. grub rescue

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http://ubuntuforums.org – Hi guys i've just update my ubuntu to 12.04. But I can't reboot since grub says "no such partition". I've read some topics around some said to post the bootscript. Quote: Boot Info Script 0.61 [1 April 2012] ============================= Boot Info Summary: =============================== => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos5)/boot/grub on this drive. => Grub2 (v1.97-1.98) is ins (Hardware)