[ubuntu] Help Wifi problem with Dell Inspiron 1520

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http://ubuntuforums.org – To begin I have a Dell Inspiron 1520. I am dual booting Windows 7 and Ubuntu 10.10. My wireless card is built into the computer. The card is an Intel Pro wireless 3945 ABG. Currently wireless is work on Win 7 but not Ubuntu. The other day when I started Ubuntu wifi was working great but now when I right click on the networks icon the "enable wireless" option is listed in dark grey. I cannot add a wireless network manually. So far I have looked up some information from terminal. I am posting it for some more background information. I am very new to Ubuntu and Linux so any help would b (HowTos)