Even before Ubuntu 9.04 arrives April 23, System76 has reason to celebrate. The PC maker - which specializes in Ubuntu systems - grew its first quarter 2009 revenue more than 60 percent compared to 1Q 2008,  according to System76 President Carl Richell. But Richell isn't resting on his laurels. He's making sure System76 is ready to catch the Ubuntu 9.04 wave - from servers to netbooks. Here's how.