It works on my setup (upcoming ubuntu 11.04). What image, VM are you using?
Alex Image ----- /home/laza/Desktop/Squeak 4.2 All-in-One.app/Contents/Resources/Squeak4.2-10966.image Squeak4.2 latest update: #11018 Current Change Set: Unnamed1 Virtual Machine --------------- /home/laza/Desktop/Squeak 4.2 All-in-One.app/Contents/Linux-i686/lib/squeak/4.4.7-2357/squeakvm Squeak4.1 of 17 April 2010 [latest update: #9957] Unix built on Jan 23 2011 18:17:32 Compiler: 4.3.2 platform sources revision 2357 VMMaker versionString 4.4.7 Operating System/Hardware ------------------------- unix linux i686