I have ubuntu installed as the sole OS on a T420. Before this I had installed the #! distro (and Xubuntu before that) and wireless worked seamlessly on either. My home hotspot shows up but when I click on it tries for a while before disconnecting.
Before going into the problem further, I wanted to double check that I entered the wifi password for my home network correctly. I went to Edit Connections >> Wi-Fi Security and changed the key, but it is still not able to connect. So I think the password is definitely correct. I don't understand why it can't connect now.
cd /etc/NetworkManager/system-connections
&ls
to list down all saved AP's.. Once you noted your AP, issuesudo rm you_access_point_name
to remove & restart your network manager withsudo service network-manager restart
.. see whether it helps! :) – AzkerM Feb 08 '14 at 07:04