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Image build
prereq on my dev machine
sudo apt install schroot pigz debootstrap syslinux nfs-kernel-server tftpd-hpa xorriso pxelinux zfsutils-linux cd /lab/livenet/livenet-server rm -fR /etc/schroot/livenet ln -s `pwd`/etc/schroot/livenet /etc/schroot/ [ -f /etc/default/livenet ] || cp -a etc/default/livenet /etc/default/livenet
Build image (xenial 64bit) named for example xenial-test (NAME=xenial-test)
ln-image --new-name bionic --create
This command create a chroot into /livenet/images/bionic