in my case kubuntu had mistakenly installed "generic" and "x86_64" kernels but NOT the "386" kernel and headers . i unistalled both "generic" and "x86_64" kernels and installed only the "386" kernel. everything works great now.
-- [X600] Black screen with DRI https://launchpad.net/bugs/35601 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
