Cannot “Install New Software” in Eclipse 3.5

Question

I have just installed Eclipse 3.5 for Java EE developers (\"Galileo\").

I need to add an extra plugin, but when I select the \"Install New Software ...\" menu item,

Answer 1

GDK_NATIVE_WINDOWS=true also solved the non-clickable button problem for me running gnome 2.28.1 with Ubuntu Karmic (9.10) x64 with kernel 2.6.31-14-generic