By default Ubuntu uses DHCP and Gnome NetworkManger to configure interfaces. This is not optimal in many cases.
How to configure a desktop machine for a static IP address that applies to all users?
Additional background: For 99.9% of users a static DHCP entry is probably the easiest solution, however I have found a conflict with
mythtv-background process and any changes to the eth0 interface. If the interface is brought up/down after mythtv is running, it hangs the process (which also broke system suspend). So my questions really needs a static IP address, where the interface is brought up with a known IP, and stays up permanently.