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Petasan 3.2.1 UEFI boot installer fail

I'm about to get back to re-evaluating Petsan and my eval cluster was over two years old so I pulled down a new ISO (3.2.1) for install and created a USB boot (via dd at the command line).  The stick boots but under UEFI boot it fails to load the UEFI portion and errors in Grub at "/boot not found"  It will boot and install in BIOS mode but I do not want to boot and install in BIOS mode. =)

I've tried on 4 different UEFI systems and the same behavior is exhibited.

We do support UEFI mode, but make sure UEFI Secure Boot is disabled in your BIOS settings. secure boot requires the OS vendors (us) to register with some UEFI authority so that only approved OS images can boot your hardware.

What changed with the 2.x release and the 3.x release where it no longer boots UEFI.  My test cluster was installed via UEFI boot on the 2.x train and will no longer boot via UEFI with the new release.  I'm pretty sure secure boot is not enabled on the Dell Poweredge 730s I'm testing on but I will double check tomorrow (these are the same systems I was running the old version on, booting uefi for install)

just tied new UEFI install both on vm and on bare metal with no issues.

We use Rufus to create bootable USB iso.

I figured this out -- my boot USB was ISO9660 and not FAT, obviously UEFI requires the file system to be FAT.  Corrected.  Thanks!