If you have a wifi LAN card / USB adapter, then you can use it as an access point so that other machines can connect to the internet via your machine using Wifi. The process is fairly simple, but requires you to have a compatible set of drivers which allow a wifi lan card to come into “Master” mode. It didn’t work well for Linksys WUSB54GC v3 USB adapter. Till Ubuntu 10.04, there were no good driv