The help output and the man page you're talking about refer to a very old LTSP
version.
Both of them have been rewritten last year, so they're already fixed.
Many of those options are not supported anymore, though, because other ways to
do things were implemented.
** Changed in: ltsp (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1254832
Title:
Missing options for ltsp-update-image
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