Ubuntu not connecting to my wifi

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http://askubuntu.com – I have wireless modem name KOG. The signal on this is low so what I did is set up a wireless router that connects to that modem and name it KOG2. With windows I can connect to both networks no problem but in Ubuntu I cannot connect to KOG2. I am getting a connection failed message. How can I fix this cause the signal on the original KOG is weak. (HowTos)