Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have tried a live CD for both 12.10 and 13.04 and done the install alongside Windows 7 option. It gets to the point it asks me where to install and the ONLY option in the drop down is my WD Passport external drive. I have not created a partition on my internal drive. Either way, Ubuntu completes the install, and reboots. Immediately Windows 7 loads, no option to boot to Ubuntu to try it out. If I go into the boot options by using F8, I can change boot device and my external drive shows twice. If I select the one, I get a GRUB prompt that says it can not boot. If I select the other (SES) then it starts into Windows 7 right away (Windows is not installed on that drive, although there is a partition there for backup files). Is Ubuntu unable to boot from an external device? Would seem odd since a flash drive or CD both work. Or do I need to create a partition on my internal main drive to allow Ubuntu to dual boot?

share|improve this question
    
How many bootable devices show up in your BIOS? –  Brandon Bertelsen Apr 27 '13 at 1:38

1 Answer 1

This is probably a /etc/fstab problem.

You have to reboot with the live CD, mount the external disk (where you installed Ubuntu), and check the /etc/fstab file that resides on that external disk.

You have to edit /etc/fstab to make sure that when you boot from the external disk, the root of your filesystem is mounted on that bootable disk (probably /dev/sdb1).

See: https://wiki.archlinux.org/index.php/Fstab

Then you have probably another problem. GRUB sets root on (hd0,0), the first disk, first partition. (but that is the sda-disk, first partition).

So GRUB must set root on the second disk,first partition, that is (hd1,0) Still running the live CD, you have to run grub-installer.

See: http://www.tuxradar.com/answers/677

Afterwards, check your /boot/grub/grub.cfg file.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.