Installed ubuntu-image version 1.4+16.04ubuntu2 from xenial-proposed in a xenial schroot, created a classic and snap-based image:
$ sudo ubuntu-image classic -s xenial -p ubuntu-cpc -w work/ -O out/ /scratch/prime/ -> Resulted in a bootable image in out/pc.img
$ ubuntu-image snap -d -O out2/ /scratch/pc-amd64.assertion -> Resulted in a bootable image in out2/pc.img
Since those two test-cases are the main requirement for verification of the bug, considering verification passed.
Installed ubuntu-image version 1.4+16.04ubuntu2 from xenial-proposed in a xenial schroot, created a classic and snap-based image:
$ sudo ubuntu-image classic -s xenial -p ubuntu-cpc -w work/ -O out/ /scratch/prime/
-> Resulted in a bootable image in out/pc.img
$ ubuntu-image snap -d -O out2/ /scratch/ pc-amd64. assertion
-> Resulted in a bootable image in out2/pc.img
Since those two test-cases are the main requirement for verification of the bug, considering verification passed.