I had difficulty connecting to my university secure Wi-Fi network through Ubuntu 13.1. Basically, I kept getting a CA certificate error. The solution was remarkably simple for me. I only had to manually change the “Authentication” to Protected EAP (PEAP). Full Wi-Fi Security connection settings as follows:
Security: WPA & WPA2 Enterprise
Authentication: Protected EAP (PEAP)
Anonymous identity: (blank)
CA certificate: ca-certificates.crt (located in File System-etc-ssl-certs)
PEAP version: Automatic
Inner authentication: MSCHAPv2
May not be this simple for all people, see also here.