Preamble
This ‘how to’ uses the NetworkManager Applet, which is installed by default on Ubuntu. In the example a wireless internet connection (wlan0) is shared with a wired (eth0) machine/device (e.g. Xbox 360, other PC, switch, etc).
Steps
1. Right click on the NetworkManager applet in the system tray, and select ‘Edit Connections…’ from the menu.
2. Select the ‘Wired’ tab, select correct connection typically some variant of ‘eth0′.
3. Click the ‘Edit…’ button to the right, you’ll likely be asked for your password after clicking this.
4. Select the IPv4 Settings.
5. Change ‘Method’ to ‘Shared to other computers’.
There we go now your Xbox 360, other PC, etc should be able to connect to the internet.
