I have installed ubuntu on this Mac computer and it was working fine on our schools wireless network, which doesn't require any kind of security. But one day it said "Authentication required by wireless network"

Passwords or encryption keys are required to access the wireless network '(Network Name)'

wireless security: none

It won't let me change the type of wireless security, the only option is none, and it won't let me connect. I can connect to the wired network fine, but not the wireless.

Running Ubuntu 8.10, wireless still works in Mac OS, just not in Ubuntu. Anyone have any suggestions?