I have done 3 small Edubuntu setups over the last year, two on Dapper and one Edgy, and I agree with all that Gavin says, with the addition of a gigabit nic for the server and a switch with at least one gigabit port to serve a classroom. The terminals are happy with 100Mbit/sec. For smaller setups I use servers with three 100Mbit nics, one for the 'internet' and two for the terminals (5 terminals on each server nic), but that needs a bit of tweaking to set up. 1Gb RAM seems to cope with 10 users. My servers use software RAID1 (mirroring) and standard IDE drives.
Also, if your terminals are old, they will boot rather slowly on Edubuntu. I have 233MHz Pentiums with 48Mb RAM as terminals, and these do better with the older LTSP 4.2 setup. I am happy to say you can easily do a 'workstation' Edgy Edubuntu install on the server and then install LTSP 4.2on that to get better startup times with these old terminals, without having to forgo local devices, though sound is dodgy. Hopefully you will have more up-to-date terminals if your demo is important! Steve
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