Can't boot Ubuntu installation from USB drive

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Answer: 1

21 hours ago

I've installed Ubuntu on a USB drive using another Ubuntu Live USB.

I've formatted that drive with a single partition and mount point /.

The Live USB then fully installed Ubuntu there, and it finished successfully.

However, I can't seem to be able to boot Ubuntu from that drive.

The Live USB was created using Rufus and was configured to use GPT and boot in UEFI mode, which it does. I also don't have Secure Boot enabled in my UEFI configuration.

What could be the issue that prevents the installed Ubuntu drive to boot? Could it be installed with MBR for BIOS? How do I prevent that during the installation?

If I try to boot in CSM mode, grub shows up in rescue mode.

I've never had an issue booting the Live USB drive.

Added by: Kaci Lang

Answer: 2

26 hours ago

The EFI menu (some key at power-up) should offer choices of Windows, ubuntu,... Choose ubuntu. That boots off the hard disk, runs ubuntu off the USB. If that works, make an EFI partition on the USB, and copy everything off the hard disk's EFI to the one on the USB -- now the USB should boot when selected.

Unfortunately, now the PC will not boot without the USB (grub looks for its files, doens't find them since no USB, and fails). Change the boot order with efibootmgr to remove the ubuntu choice, and Windows should be first on the hard disk. So put the USB first in boot order, grub runs, and you should be able to select ubuntu or Windows, without the USB, Windows boots.

Added by: Wade Eichmann

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