This is just an FYI for the present, in case anyone else has a similar setup to mine.
I have really old terminals (48Mb Pentium-1 233MHz), and so I have been using LTSP-4.2 on an Edubuntu workstation setup to create my terminal servers. This used to work fine up to Gutsy Tribe 5, but my testing shows that some change in GDM between Tribe 5 and 7.10 release has caused XDMCP connections to fail from the terminals unless the plain greeter is used. The terminals try to connect, fail, and keep trying repeatedly; before long GDM hits the max session limit and refuses to allow any further connections. I lack the time to investigate properly for the next couple of weeks. The problem is probably linked to this thread http://ubuntuforums.org/showthread.php?t=565383 and this bug report https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/150193 . I haven't created a bug report for this setup since it is hardly a supported configuration. However, it may also affect conventional LTSP 5 terminals set to use 'startx' instead of LDM - I haven't tried. As I said, this is just a heads-up in case anyone else is using such ancient hardware!
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