I just upgraded to 12.10. Everything appears to go well but I am unable to connect to the Internet. The LAN is fine and I can view my shared files but no e-mail or access to web pages. My other computer which is running 12.04 or older seems to connect fine. I only upgraded one to make sure things would be ok. I am currently connecting fine with a wireless Windows laptop.
Output from cat /etc/resolv.conf
# Generated by NetworkManager nameserver 127.0.0.1