Upgrade to 10.04

[Steve Wu]

I had a Edubuntu 8.04 install that I ran through the upgrade cycles up to 10.04. Now when my client PCs try and connect up, they get: 

PXE-T02 - Forbidden Directory 
PXE-E3C - TFTP Error - Access Violation 
PXE-M0F - Exiting PXE ROM 

Can someone point me to which rock to look under to get things rolling again? 

Thx! 
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