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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?

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Please move your answer to the answer box. Answers don't belong in questions. Thank you! –  Elder Geek Jun 24 at 13:56
    
For more about grub you can read the docs here: help.ubuntu.com/community/Grub2 –  Elder Geek Jun 24 at 14:08

1 Answer 1

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.

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