I have installed 64-bit Ubuntu 12.10. I have Intel cupertino-N 6150 wireless adapter.
At university, where I have no password, I am able to connect to the wireless network seamlessly, however at home, where I have a password, I cannot connect.
I am sure that the password I type is correct ( I rechecked the password on the other devices which connect)
I tried different security settings, still without any luck.
After restarting the router my computer was able to connect to the network. Do not repeat my mistakes -)