Hi, I just did my first Linux install (Kubuntu) onto an external NVME drive. It boots fine on my laptop but gives me a “MBR error, insert floppy” screen when I try to run it on my desktop. On the motherboard settings the drive shows as a bootable option but without a UEFI label. What issues could cause this? From what I’ve read it seems like a boot loader problem but I have no idea why it would be fine on one device but not another. I tried to update the motherboard firmware but the file the manufacturer provides wasn’t working. It’s running a 2021 version.

Edit: I figured it out. The issue had nothing to do with my Linux installation. My motherboard had a hidden option to change the UEFI boot order, which is entirely separate from choosing which drive to boot from.