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Boot Repair

Boot-Repair is a GUI tool to repair various boot issues you may encounter in Ubuntu like when installing Windows or another Linux distribution and you can't boot Ubuntu or GRUB is not displayed anymore, some upgrade breaks GRUB, etc.

Boot-Repair lets you reinstall GRUB bootloader with a simple click, but there are also some advanced options available if you want to specify the partition where GRUB should be installed or purge and reinstall GRUB. The application also allows you to restore the original boot sector (MBR) if it was saved using Clean-Ubiquity (another application created by the Boot-Repair developer) and select the default OS.

You can use Boot-Repair from a regular session, but since its supposed to repair the GRUB, you'll most probably need to use it from a Live CD so boot an Ubuntu Live CD and then install Boot-Repair using the commands below (yes, you can install it on the Live CD!):
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair

Once installed, launch it from Dash, or if you use the classic GNOME Desktop, you'll find it under System > Administration > Boot Repair.

Boot-Repair is available for Ubuntu 12.04, 11.10, 11.04, 10.10 and 10.04 and it only works with GRUB 2.

I've tested the application in VirtualBox (by breaking GRUB on purpose) and using the default settings, Boot-Repair was able to fix GRUB and get Ubuntu to boot again.

Warning: messing with the GRUB can cause your computer not to boot so only use this if you really have to (can't boot already)!

Boot-Repair, along with Clean-Ubiquity are available on a live CD called Ubuntu Secured Remix 11.04 which you can download from here here.