Package dependency bug running umpc-ubuntu-respin.sh from vanilla 20.04 Ubuntu package = cd-boot-images-amd64

[avoiceofreason]

umpc-ubuntu-respin.sh tries to install cd-boot-images-amd64 package on line 141:

apt-get -y install cd-boot-images-amd64

This package does not exist on Ubuntu 20.04, so fails with error.

A 22.04 version package can be installed manually using:

wget http://mirrors.kernel.org/ubuntu/pool/main/c/cd-boot-images-amd64/cd-boot-images-amd64_20_all.deb sudo apt install ./cd-boot-images-amd64_20_all.deb

There also seems to be a bunch of cleanup errors after an .ISO has been built

[SpookOz]

Thank you! you saved me quite some time looking for a solution to this!