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I've been running 10.04 on an external USB HDD without problems for years.

I installed 12.04 on an external USB HDD and it worked until I upgraded to all the new packages. But after that it wouldn't boot. I just got into the grub prompt.

So then I tried installing on the disk inside the computer and that worked fine. But when I take it out and use it as an external USB HDD I just get:

error: hd0 out of disk.
grub rescue>

How can I fix this? So why do I want this you might wonder? Well I have a laptop at home and a somewhat similar at work. And I just move the disk between them and don't have to move a heavy laptop. So I really hope I can continue doing this with 12.04!

The old disk is only 80Gb but the new one is 320Gb (7200rpm Toshiba). I'm using 12.04 on a 64Gb SSD as an external drive and it warns about out of disk but it boots anyway most of the times.

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I tried installing on my SSD again and it works without any problems and I can boot even after having updated all packages. I used it as an external disk when installing on it. So it seems like it's a problem with the larger disk? – Ben Andersen Aug 10 '12 at 17:16

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