[ubuntu] update from 11.10 to 12.04 won't boot, Grub problem

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http://ubuntuforums.org – Dual boot system, Win XP and Ubuntu 11 with Grub, working fine. Update from 11.10 to 12.04 runs smooth, at end I reboot. At boot, Grub menu won't appear, I get: error: out of partition grub rescue> Tried the boot-repair disk. Single click "fix" has no effect, same problem. Links to system info from boot-repair: http://paste.ubuntu.com/1033099 http://paste.ubuntu.com/1033112 http://paste.ubuntu.com/1033126 Boot-repair says /dev/sda6 (my Ubuntu boot partition) looks for core.img at 484962101 but it isn't there. Booted to GPartEd, went to cmd prompted, tried this: mount /dev/sda6 (Hardware)