Ubuntu 12.04. WiFi not working at laptop or notebook. Unblock it.

Ubuntu 12.04.  WiFi not working

Check if the wifi card is blocked (Terminal)

rfkill list wlan     (for wifi)


rfkill list all             (for wifi and bluetooth)


rfkill unblock wlan     (for wifi)


rfkill unblock all             (for wifi and bluetooth)


Restart the network:

sudo service network-manager restart


For message:

device not ready firmware missing

Install the the b43 driver:

sudo apt-get install firmware-b43-installer