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 blocked: no
Hard blocked: no
rakesh@rakesh-C-Notebook-XXXX:~$ lsmod | grep -e brcmsmac -e wl
wl 2646601 0
lib80211 14040 1 wl
rakesh@rakesh-C-Notebook-XXXX:~$ sudo modprobe -r wl
[sudo] password for rakesh:
rakesh@rakesh-C-Notebook-XXXX:~$ lsmod | grep -e brcmsmac -e wl
(showed nothing)
rakesh@rakesh-C-Notebook-XXXX:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

rakesh@rakesh-C-Notebook-XXXX:~$ sudo iwlist wlan0 scan
wlan0 Interface doesn't support scanning.

rakesh@rakesh-C-Notebook-XXXX:~$ sudo modprobe brcmsmac
(showed nothing)
rakesh@rakesh-C-Notebook-XXXX:~$

I can only connect through ethernet cable.
Please help me so that I dont have to shift back to Windows.