Comment 9 for bug 1692876

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Paweł Moll (pawel-moll) wrote : Re: ubuntu-server ARM64 ISO images not EFI compliant

That means, I believe, that your EFI can handle ISO9660 - one of my boards can do it as well (and indeed I had the same problem with /cdrom at the installer level on it). The rest - don't like it at all.