Comment 8 for bug 1692876

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Ard Biesheuvel (ard-biesheuvel) wrote : Re: ubuntu-server ARM64 ISO images not EFI compliant

In my case, UEFI can find grub just fine after I dd the .iso straight to a USB stick. However, the installer fails to mount it under /cdrom, which seems to be caused by the fact that cdrom-detect invokes list-devices in a way that dismisses USB sticks without a partition table.

The workaround is to enter the shell and mount the device on /cdrom manually, after which the installer proceeds happily.