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The wireless card is not working but the Internet is working good with Ethernet cable.
The output of lspci is :
02:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
At fist the card was working but sometimes it's disconnected, and have problem on coverage range, and sometimes it's not working at all
I tried many solutions on the Internet but now it's not working at all.
I don't know what to do :(
This forum post seems to have helped most people facing this issue.
I have reproduced the necessary steps here for the sake of simplicity.
In the Additional Drivers application, check for any drivers pertaining to STA and disable them.
Open Terminal and enter the following command:
sudo apt-get remove b43-fwcutter broadcom-sta-common broadcom-sta-source firmware-b43-installer firmware-b43-lpphy-installer firmware-b43legacy-installer bcmwl-kernel-source
Now, enter the following commands:
echo "blacklist bcma" | sudo tee -a /etc/modprobe.d/blacklist.conf
echo "blacklist brcm80211" | sudo tee -a /etc/modprobe.d/blacklist.conf
Reboot Ubuntu.
Open Terminal again and enter the following command:
sudo apt-get install bcmwl-kernel-source broadcom-sta-common broadcom-sta-source firmware-b43-installer
After the package installation is complete, reboot.
Open Additional Drivers.
Enable the Broadcom STA driver.
Your Wifi should now be active and functional.
This seems to be a documented bug.