Last week Microsoft released Virtual PC 2007 Service Pack 1, with support for Windows Vista SP1 and Windows XP SP3 as host and guest, and Windows Server 2008 Standard as a guest OS. In the past, I've been underwhelmed with Virtual PC, but this update is surprisingly snappy. If you're thinking about installing Ubuntu 8.04 in a virtual machine, you'll get an error message almost immediately. Conspiracy? Nope. I'll show you where to find the simple, step-by-step workaround to get it running right.