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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.

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Could you please try to remove the current access-point by changing to the directory. Using a terminal cd /etc/NetworkManager/system-connections & ls to list down all saved AP's.. Once you noted your AP, issue sudo rm you_access_point_name to remove & restart your network manager with sudo service network-manager restart.. see whether it helps! :) – AzkerM Feb 8 '14 at 7:04
@AzkerMohamed it did indeed :) Thanks! Could you post this as an answer? – yayu Feb 8 '14 at 7:09
I'm glad it helped you. I've posted it as an answer. :) – AzkerM Feb 8 '14 at 7:29
up vote 2 down vote accepted

Could you please try to remove the current access-point by changing to the directory. Using a terminal

  • Open a terminal (CTRL+ALT+T) & type below command in a sequence;
cd /etc/NetworkManager/system-connections      # locate all the stored network profiles
ls                                             # list down the network profiles
sudo rm you_access_point_name                  # removes the specified profile
  • Restart your network manager with;
sudo service network-manager restart
  • Try connecting to the WiFi once restarted.

Hope it helps!

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recently on two ubuntu installs the wifi network was no longer seen (possiblty caused by an update), following your steps and doing a restart fixed it – Răzvan Panda Mar 1 '14 at 17:40

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