My wireless won't connect in Ubuntu 12.04 LTS, newly installed on my Dell Inspiron 1525

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http://askubuntu.com – I am a brand new user to Ubuntu (all of my previous experience being in Windows). I have recently begun to dual boot for the sake of work, so I installed Ubuntu 12.04 on my Dell Inspiron 1525. It possesses a Broadcom BCM4312 Wireless card. I have no troubles getting an ethernet connection to work, but my wireless is acting odd, to say the least. I can see all available networks (obviously including my own), but whenever I try to connect to it, it repeatedly asks me to authenticate the connection. I am absolutely positive that I am inserting the correct passphrase (WPA security setting), b (HowTos)