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[ubuntu] Wireless connection not working. Can connect through ethernet cable. Using Lenovo.

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http://ubuntuforums.org – Hii! I am new to Ubuntu My wireless connection worked very well on Windows and Ubuntu 9.04 But it is not working now. I am using Ubuntu 12.04 LTE on the Lenovo G Series laptop. I tried the codes given on the forum. rakesh@rakesh-C-Notebook-XXXX:~$ lspci -nn | grep 0280 03:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01) rakesh@rakesh-C-Notebook-XXXX:~$ rfkill list all 1: ideapad_wlan: Wireless LAN Soft blocked: no Hard blocked: no 2: ideapad_bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft block (Hardware)