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.
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Does your desktop support UEFI boot?
Yes
Do you have an option to allow legacy USB boot? My desktop has this off by default so will not boot from a USB drive
The motherboard will only give me the option to use linux if it’s in legacy mode. In UEFI only mode it doesn’t show up.
Is secure boot turned on? If so you will probably need to turn that off. EFI boot entries get set in the UEFI somehow, so once you get it booted it should see it. But how old is the PC? Could be a limitation if it is old.
I assume you installed Kubuntu to the external drive on your laptop, in which case it likely installed the boot record into the laptop’s main drive
I ran the installer on the desktop with all other drives disconnected
