Drop support for lenny, squeeze, wheezy, jessie, stretch + buster Debian releases and default to bookworm Debian lenny (v5), squeeze (v6), wheezy (v7), jessie (v8), stretch (v9) and buster (v10) are all EOL and we don't support any of them any longer.
Provide sources.list setup for DEBIAN_JESSIE Otherwise executing 'grml-live -s jessie' fails hard