My friend and I got 410c's. Both of us are having an issue with DHCP over the built-in wifi on Ubuntu. What's common between our setup is that we use an AT&T-provided xDSL gateway.
Wifi AP's system log shows authentication is successful, but 410c cannot retrieve an IP address from the DHCP server. If I manually enter an IP address, gateway, and DNS addresses, I can browse the internet, so wifi hardware must be alive. I have tried different snapshots/releases of Ubuntu with no luck.
I also tried another router, which is just my cellphone's hotspot feature, and this one actually works fine. DHCP lease is successful and I can browse the internet.
Because of this problem, I am currently using a USB wifi dongle for which I managed to compile the driver (this was really painful), but I am wondering if other people are seeing the same problem and if there is any solution for this. I see that the built-in wifi has been behaving very strange as discussed here: https://www.96boards.org/forums/topic/410cubuntu-cant-ssh-in/ but not sure if this is related. I'm "guessing" that the known issue with the built-in wifi is causing a problem with a certain implementation of DHCP (like the one in my router).