Ubuntu 11.10 doesn't boot after installation, only boots into Windows 7

Question

Windows 7 was pre-installed on my machine. Ubuntu 11.10 doesn't boot after I installed it. Once Ubuntu finished its installation, I restarted.

After that, it just boots straight to Windows 7, no sign on Ubuntu at all.

score 3 · Accepted Answer · edited Dec 15 '12 at 08:28

If there was no error while installing then you can re-install your GRUB as follows:

First, boot from a live CD
Second, open your terminal and write sudo fdisk -l to see all your partitions and exact name of your linux one (sdxy) where x means the hard number (a,b,c,...) and y the number of partition (1,2,3,4,...)
Third, after that you should write these following instructions:
sudo mkdir /media/root
sudo mount /dev/sdxy /media/root
sudo grub-install --root-directory=/media/root /dev/sdx (without y number!)
sudo update-grub

score 1 · Answer 2 · answered Jan 04 '12 at 13:41

Something likely failed with the Grub installation.

There are multiple ways to tackle this.. but ill give you the short one

boot the Ubuntu live disk
mount your root directory(the partition you installed ubuntu on)
- this can be done commandline or through the file browser
then use:

sudo grub-install /dev/DRIVE

DRIVE is the drive first starts as selected in the BIOS.. usually this is /dev/sda

2 Answers2