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I have Ubuntu 16.10 installed on my hard drive and Windows 8.1 on my USB. When it is plugged in, I normally go to BIOS each time to edit startup order in order to load the one I want.

Is there a way to use GRUB to choose between OS's on my USB and Ubuntu? (I already made it so GRUB always loads on startup.)

I have looked at other questions and none worked.

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  • grub should choose to boot either os. is windows not on the list? – Panther Jun 5 '17 at 18:38
  • No, I'll try again though. Restarting – Hayden Jun 5 '17 at 18:39
  • @bodhi.zazen Nope, it doesn't show. But if I change BIOS boot priority to have external drives higher than internal drives then it just loads up Windows without GRUB. – Hayden Jun 5 '17 at 18:45
  • Do you have a grub menu with multiple ubuntu enteries ? askubuntu.com/questions/16042/… If not, hold shift, If so we need to add windows. – Panther Jun 5 '17 at 18:49
  • On my GRUB menu I have: Ubuntu, Ubuntu Advanced, Memtest (something), and another Memtest (something). By something I mean I forgot what it said there. So 2 Ubuntu and 2 Memtest. – Hayden Jun 5 '17 at 20:17
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I found out my answer. With the USB plugged in type in the command line:

sudo update-grub

Along with the normal Ubuntu and Memtest it said:

Found Windows 8 (loader) on /dev/sdb1

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