I'm trying to install a wifi driver on a Dell E6400 laptop. I found a forum article that pointed to the right drivers, but can't get them onto the system. I'm new to Ubuntu, with only minimal experience of Linux and UNIX. The "jockey"/Additional Drivers method given in article How do I install drivers for graphics and sound? doesn't seem to have a visible option to install anything, so it seems a bit pointless. I also get an error "Downloading package indexes failed, please check your network status" before Additional Drivers displays. Catch 22! I also looked at Software Center, after reading another posting. This also has no way to manually install a driver (or anything. . .), it's just a big empty shop window. I suspect I'm missing something important here!
If wifi is not working then , 1st time initially you should connect your pc/laptop with cable/LAN network and try these step:-
Open Additional Drivers option in ubuntu ( press windows key and find "Additional Drivers" or you can also find this option in "system settings"),
it will automatically find correct drivers for your pc/laptop and choose option to select and install it.
Generally it will find wifi, graphic Proprietary drivers.