[ubuntu] First time installing LTSP, PXE-E53, need help please.

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http://ubuntuforums.org – I downloaded the Ubuntu 11.10 64-bit alternative CD and pressed F4 at the beginning of the install to setup an LTSP server. During installation I saw a screen saying it was installing LTSP. But after the install, I updated the server with apt-get and rebooted it.. then tried to connect a laptop via network boot (the laptop is wired, plugged into the same dlink switch as the server, no VLANs), and got this error: Quote: PXE-E53: No boot filename received The DHCP server is not any of these devices, it's a router connected to the d-link sw (Hardware)