Dual boot on portable drive

Asked by Shoikot

I have Windows Vista installed on my PC's internal hard disk. I have installed Ubuntu on my external hard disk. During booting a boot screen appears to select the operating systems I wanna boot. So, far it's ok. But the problem is when I try to boot my computer without my external hard disk, a black screen appears and shows me "error 21". How can I boot my computer in Vista without my external hard disk?

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Ubuntu grub Edit question
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Claudio Arseni (claudio.arseni) said :
#1

It is a problem with your grub configuration.

You can see there:

https://help.ubuntu.com/community/GrubHowto

Hope this help.
Regards

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