I have an Acer Spin315 I am trying to upgrade from Windows 10 to Ubuntu. But I cannot get the thing to boot from anything other than the hard disk. I quit using CD/DVD long ago. The EFI boot list has the USB devices listed first but the specific USB disk doesn't show up as bootable. I used DiskPart to create a FAT32 partition for the ISO and an EFI partition. Does the EFI have to be the first thing on the disk? If so, any thoughts how to make that happen? Thanks.
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