# Pastebin Xilq7ov2
 raw=xenial-server-cloudimg-amd64.raw
csmith@fringe:~$ ptuuid=$(sfdisk --part-uuid $raw 1)
sfdisk: xenial-server-cloudimg-amd64.raw: partition 1: failed to get partition UUID
csmith@fringe:~$ file $raw
xenial-server-cloudimg-amd64.raw: DOS/MBR boot sector
csmith@fringe:~$ sfdisk --part-uuid $raw 1
sfdisk: xenial-server-cloudimg-amd64.raw: partition 1: failed to get partition UUID