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I've just installed Ubuntu on my external HDD, during the installation it also installed GRUB boot loader since I’m also running windows 7 on my internal HDD. After the I installation though, I got a GRUB boot error:

error: no such device: 54c36c16-b07e-40d3-9fe6-0bbb47a418bd
entering rescue mode...
grub rescue> _

I've already read several other tips and instructions on other forums that told me to enter the following code:

set root=(hd0, msdos2)
set prefix=(hd0,msdos2)/boot/grub
insmod normal

I tried this with all of my listed partitions but every time I enter "insmod normal" it gives me an "unknown file system". What should I do?

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Try boot-repair. – Avinash Raj Nov 27 '13 at 5:16

(Answering my own question??)

My GRUB was out of date, so I simply created a boot recovery live USB drive with "Boot Repair" and suddenly everything was back to normal!!

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