Wikipedia
Gobuntu
Gobuntu was a short-lived official derivative of the Ubuntu operating system that was conceived to provide a distribution consisting entirely of free software.
Because Ubuntu now incorporates a "free software only" installer option, the Gobuntu project was rendered redundant in early 2008. As a result, Canonical made the decision officially to end the Gobuntu project with version 8.04.
In March 2009 it was announced that "Gobuntu 8.04.1 is the final release of Gobuntu. The project has merged back to mainline Ubuntu, so there is no need for a separate distribution".