There is many cases that cause losing boot loader, such as installing windows after ubuntu, then you will loose ubuntu's boot loader (GRUB), anyway if you lost boot loader or it has been damaged for whatever reason you can reinstall/repair it easly using Live CD via the following steps
The first thing is "Boot your computer with the Ubuntu CD"After that you will need to follow one of the following two methods to recover/install GRUB
The first thing is "Boot your computer with the Ubuntu CD"After that you will need to follow one of the following two methods to recover/install GRUB
