Jerome,

> 7500: Sound is missing from vm Squeak-4.0.3.2196-linux_i386
> http://bugs.squeak.org/view.php?id=7500

Sorry - I was missing a development library on my build host.  Does  
this one work for you?

http://piumarta.com/tmp/Squeak-4.0.3.2196-linux_i386.tar.gz

Cheers,
Ian

PS Thanks for the info about launchers.  I use them from the toolbar  
all the time; had no idea they work on the desktop too.