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I thought that would be common question, but I could not find an answer so far.

How do I avoid GRUB2 to be installed at all? Whatever I try it always gets installed an than I can't boot Windows from internal disk when the external disk (with ubuntu) is disconnected.

user3626099
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1 Answers1

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When installing Ubuntu to the external drive, using the something else option, you need to ensure that you select the correct device for bootloader / grub installation.

Usually Sda is your internal drive and your USB drive will be Sdb if you have no other USB devices connected.

This way the internal hard drive / windows bootloader will not be modified in anyway.

Have a look at my answer on How to Install Ubuntu To USB Drives, it has all the details and should help you.

Below is an image, showing the 'bootloader installation' menu highlighted in red at the bottom.

bootloader install option

Image Source : help.ubuntu.com/community/Grub2/Installing.

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Fernhill Linux Project
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  • I've done this and it still writes an entry to the UEFI table on the HDD that is placed above Windows and requires the flash drive to be plugged in. – Shanteva Oct 22 '16 at 15:41