Usage:
  See ./fll --help

Example Usage:
  1) sudo apt install python3-apt python3-configobj gdisk xorriso \
  	cdebootstrap squashfs-tools
  2) cp fll.conf fll.local.conf; edit ../fll.local.conf
  2) ./fll -c ../fll.local.conf -b /tmp/fll/ -o /tmp/fll/

Dependencies:
  python (>= 3.8)
  python3-apt
  python3-configobj
  cdebootstrap | debootstrap | mmdebstrap
  xorriso
  squashfs-tools
  gdisk (for gpthybrid used with grub)
  wget (for deb822-style apt data file fetching)