This is a wiki about the old, unmaintained version 5 of LTSP. The wiki about the new LTSP is here: https://github.com/ltsp/community/wiki
LTSP5 is now only supported in its old sourceforge mailing lists. Ask whatever you need in ltsp-discuss there.
The next to go will be https://help.ubuntu.com/community/UbuntuLTSP; please copy here whatever you need from that, as it will be deleted in May 2020.