Comment 2 for bug 1743177

Hi! The problem seems to be with Cubic's assumption that the squashed filesystem is in a folder named "casper". In the Ubuntu Server iso, the folder is named "install".

I posted an explanation of how I fixed the problem for myself here: https://askubuntu.com/a/1010733/800716

A good permanent solution might be to make `casper/` an editable parameter and check for the existence of the folder before continuing. The chroot command fails because the squashfs folder does not exist because the unsquashfs command couldn't find the source file.