Ubuntu 11.10 not showing up in GRUB bootloader after update and restart :(

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http://askubuntu.com – I was using ubuntu 11.10 with gnome-shell. I installed various useful softwares and ran system update using update manager which ran smoothly and asked me to restart my comp at the end. I restarted it to find that Ubuntu entries were missing from the GRUB bootloader and only memory test and windows are showing up. I took a lot of pain in installing various important softwares and cannot afford a re-installation. Tried to boot from the live cd and installed boot-repair and after running it .. it wasnt working properly .. it was just showing that it was "scanning systems" for more than an hou (HowTos)