[ubuntu] ubuntu 12.04 no wireless internet

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http://ubuntuforums.org – hi all i just recently installed ubuntu 12.04 and since install i havent been able to get wireless internet to work. when i plug in the ethernet cable it works i just dont have wireless. i have been searching around and have run out of things to do. here is the terminal i was just doing: dell@dell-Inspiron-1501:~$ lspci -nn | grep 0280 05:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01) dell@dell-Inspiron-1501:~$ rfkill list all 0: dell-wifi: Wireless LAN Soft blocked: no Hard blocked: no dell@dell-Inspiron-1501:~$ lspci -nn | grep 028 (Hardware)