Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

A few days ago I did install Ubuntu with 3 partitions, swap / and /home, then I disconnected the hard drive and I installed Windows 7 on another hard drive. The problem is: I don't get the GRUB menu to choose between operating systems.

I tried sudo grub-install /dev/sda, but it gives me the following error:

/usr/sbin/grub-bios-setup: warning: The file system 'ext2' not allow wardrobe.
/usr/sbin/grub-bios-setup: warning: Can not embed. GRUB can only be installed in this setup by using blocklists. However, blocklists are unreliable and their use is not recommended ..
/usr/sbin/grub-bios-setup: error: will not proceed with blocklists. 

What do I do?

share|improve this question
Please move your answer to the answer box. Answers don't belong in questions. Thank you! – Elder Geek Jun 24 '14 at 13:56
For more about grub you can read the docs here: – Elder Geek Jun 24 '14 at 14:08

You need to update grub menu entries.
Open a terminal by pressingCTRL+ALT+T and type the following:

sudo update-grub /dev/sdb

replacing sdb above with sda, sdb, sdc, sdd, or whatever drive your GRUB MBR resides on.

share|improve this answer

Your Answer


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.