Version: 0.0.1 (using 4.0.2 (KDE 4.0.2), Kubuntu packages) Compiler: gcc OS: Linux (i686) release 2.6.22-14-generic The application Plasma Workspace crashed and caused the signal 4 (SIGILL). Sorry my english. I'm Speak only Brazilian Portuguese
Sorry, but you need to provide more information than just saying that it crashed.
It seems, that Kubuntu and KDE 4.0.2 generates troubles. Please try again with KDE 4.0.3 and rename ./kde4 to ./kde4_old and do the same with ./kde. If it works after. Please close the bug.
Not enough information and very likely just faulty build anyway.