ubuntu installation problem

i am installing ubuntu 6.10 but it is getting stucked at "selecting and installing components" at (6%).

now i tried to install edubuntu 6.10, the error is:
[!] Build LTSP chroot
No interface for LTSP dhcpd configuration found
There are no free interfaces for usage with the LTSP server. please configure the file /etc/ltsp/dhcpd.conf manually to point to a valid static interface after the insatllation finished.

i have earlier installed edubuntu6.10 sucessfully on the same pc.
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after 5-6 tries i am able to install edubuntu. but dont know what was the problem.

[kalpik]

Dont configure internet while installing ubuntu. Switch off your modem and then install..