FOSS gamedev and creative worlds

I have Lubuntu and got Mintest from the software center. I would like to change the key bindings but it won' lett me. Every time I change then and I exit the menu it goes back to the way it was before. Alsothere are some keys it doesn't lett me use (for examle space).

did you press the save button?

The version from the 11.10/12.04/12.10 repositories is outdated (0.3.1), the latest Minetest version is 0.4.4.

Use this to install the latest version easily: http://forum.minetest.net/viewtopic.php?id=3837