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How to Add a GRUB2 Menu Entry for Booting Installed Ubuntu on a USB Drive?

2021-11-23

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Each time you upgrade kernel on external, you can run this to update boot stanza in grub on the internal drive.But you can also add a boot stanza to grub2's 40_custom that boots the partition, not the specific kernel. Ubuntu installs links in / (root) to boot the most recent install. Adjust example below if necessary to your drive & partition. Boot drive with grub is always hd0, but then other drives are in BIOS reported order which may vary.Edit with:then, add:While above works, I find the drive may change when plugging in a flash drive or any other USB device. So I am converting to use labels.

I am not asking how to boot the LiveCD from a USB.

I have 2 Ubuntu installations, one on my computer's internal hard drive and another on a USB drive.

Is there a way to add a GRUB2 menu entry (to the GRUB on my internal hard drive) to boot the Ubuntu OS which I have installed to the USB flash drive and have this same menu entry still work after I've upgraded the Linux kernel on the USB installation?

Â·OTHER ANSWER:

I am not asking how to boot the LiveCD from a USB.

I have 2 Ubuntu installations, one on my computer's internal hard drive and another on a USB drive.

How to Add a GRUB2 Menu Entry for Booting Installed Ubuntu on a USB Drive? 1

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