Comment 5 for bug 789471

That sounds like the right ISO file, and since the md5sum matches, there should be no need to download it again.

That md5sum is the same as the sum on my copy of lubuntu-11.04.iso -- so it is correct :)

I tested in virtualbox myself, so lxlauncher "works for me" in that environment.

If it does not work on your real hardware, but does work for you in virtualbox, then maybe the real issue is some kind of X driver issue for your video chipset??

I'll leave the status at "Incomplete" until you let us know the results of your test in virtualbox. It might also be good to provide some details of your (real, physical) video card, too.