Wifi not working in ubuntu

1. Connect to a wired internet connection to first install the additional drivers.
2. Check if all the hardware drivers are installed. Go to System Settings -> Additional Drivers (Under Hardware Group). It will automatically check for missing drivers and ask to activate.

3. If the above method does not work, go to Ubuntu Software Center and type 'additional drivers' in the search box. There will be results like Additional Drivers (jockey-kde) and Additional Drivers (jockey-gtk). Make sure both are installed.

4. Go to Network Connections either from Dash Home or by clicking the network icon at the top right menu of the desktop.

5. Under Wireless tab click on 'Edit...' if the connection details has already been added else click on 'Add'.
6. Under Wireless tab enter SSID as given by your internet provider. Leave all the other settings as is. Make sure 'Connect automatically' is checked.

7. Then under Wireless Security tab, select WEP for Security dropdown and enter the key as given by your internet provider. Leave all the other settings as is.

8. After the changes click on Save.
9. Wifi connections must now be detected automatically.