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I installed Ubuntu and everything went ok. I did it by looking at this guide

http://www.linuxbsdos.com/2011/05/23/install-ubuntu-11-04-on-external-hard-disk/

Then when it boots from USB I get this error at the begining while booting

disk drive for boot is not ready yet or not present

According to this guide method 1 I went to grub/grub.cfg (since in GRUB 2 its no more menu.lst) and changed all /dev/sdc to /dev/sda as the guy says in his guide, but after these changes it still gives me the same error message. Can anyone help with this issue?

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Don't complicate yourself : askubuntu.com/questions/43786/… –  Uri Herrera Sep 6 '11 at 0:40
    
This one too, take a look at my answer : askubuntu.com/questions/46624/… –  Uri Herrera Sep 6 '11 at 0:40

1 Answer 1

You should not be using /dev/anything in grub.cfg or /etc/fstab because device references are subject to change. Instead you should be using the UUID.

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