To update your grub boot loader just follow the steps below. Boot your ubuntu from live cd, mount drive where ubuntu were installed then open terminal from applications->accessories->terminal. Type 1grub-install -v . This will prompt your installed grub version. 1mount | tail -1 verify that you mount the correct drive. If it’s ok then following output will be shown 1/dev/sda2 on /media/0d104aff-ec8c-44c8-b811-92b993823444...