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I think I had the same problem. eth0 was assigned an address in the 200 range but an alias (eth0:0) was assigned 192.168.1.1 which is the same as my router. As soon as this became active (during install) all downloads started failing.
I got around it by editing /etc/network/interfaces and restarting networking. Now the install is proceeding again. Not sure what it will do about the failed downloads. I will have to wait for the reboot to see.
I also suspect, from some of the log messages flying by, that it has ignored my request to not be a dhcp server.