Comment 2 for bug 1948895

Could this be because of the boot order on the specific device?

With the Intel BIOS, you can bring up a boot menu, and choose the specific device you want to boot immediately. In this situation, multiple USB drives are not a problem, as long as the user knows which one is which. This is method I prefer, because I always know which device I am booting.

But some other BIOS, you can only change the boot order. For this situation, it's best you only have the USB drive with the live image connected, otherwise the board might try to boot the other drive(s). Sometimes this might do the right thing and try each USB drive in succession, until one boots. However, I've found this behavior to be unpredictable, especially since other options like PXE Boot can also get called, and if PXE Boot fails, it does not cause the BIOS to try the next entry in the boot table.

For this reason, I always boot with just the live USB drive inserted. Once Ubuntu has booted, then I insert the data drive to reimage the local storage device.

I did look at a way to add the image file to the drive with the live bootable image, so you would not need 2 separate USB drives however the procedure is a bit complicated and requires you to have Ubuntu installed on a separate system. So that is why I have stuck with the 2-USB-Drive method.