At home I have a Windows desktop - and one of the primary reasons I boot into it is to share my internet connection over the home wireless network. I have a setup of this kind:
Windows Desktop <--------> Wireless Router <--------> Mac/Linux Laptop (plugged in USB Internet device)
I have configured Windows to share its Internet connection over the network, using Windows Internet Connection Sharing. Instead of Windows I'd like to do the same in Ubuntu, but I gather that Linux does not share internet connections with other PCs like Windows does. What alternative do I have on Ubuntu?