FOSS gamedev and creative worlds

hello, i'm new to the forum and to the game. i just tried to dig something, but as soon as i started i got a segfault. this is what i got with a terminal:

signal_handler_init()
Using system-wide paths (NOT RUN_IN_PLACE)
path_data = /usr/bin/../share/minetest
path_userdata = /home/username/.minetest
Debug streams initialized, disable_stderr=0
22:24:36: ACTION[main]: minetest with SER_FMT_VER_HIGHEST=22, VER=0.4.dev-20120122-1 RUN_IN_PLACE=0 USE_GETTEXT=1 INSTALL_PREFIX=/usr BUILD_TYPE=Release
Irrlicht Engine version 1.7.2
Linux 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:50:54 UTC 2012 i686
Creating X window...
Visual chosen: : 282
Using renderer: OpenGL 2.1
Gallium 0.4 on ATI RV530: X.Org R300 Project
OpenGL driver version is 1.2 or better.
GLSL version: 1.2
Loaded texture: /usr/share/minetest/clienttextures/menubg.png
Loaded texture: /usr/share/minetest/clienttextures/menulogo.png
locale has been set to:it_IT.UTF-8
locale has been set to:C
locale has been set to:it_IT.UTF-8
locale has been set to:C
locale has been set to:it_IT.UTF-8
locale has been set to:C
AuthManager: loading from /home/username/.minetest/world/auth.txt
BanManager: loading from /home/username/.minetest/world/ipban.txt
BanManager: failed loading from /home/username/.minetest/world/ipban.txt
WARNING: BanManager: creating /home/username/.minetest/world/ipban.txt
experimental modname="experimental"
experimental modpath="/usr/bin/../share/minetest/mods/experimental"
22:24:47: ACTION[ServerThread]: Guybrush88 joins game. List of players: Guybrush88
Unsupported texture format
Clouds::Clouds(irr::scene::ISceneNode*, irr::scene::ISceneManager*, irr::s32, float, irr::u32)
locale has been set to:it_IT.UTF-8
locale has been set to:C
GUIPauseMenu: Not allowing focus change.
node_dig
22:24:56: ACTION[ServerThread]: Guybrush88 digs default:dirt_with_grass at (4,10,0)
Segfault

i'm on ubuntu 11.10 and i installed the latest version of the ppa

this is the content of the debug.txt file: http://pastebin.com/e61qAaei

Could be the video drivers. Go System Settings - Additional Drivers, if it suggest something, install it.

EDIT That's for Classic Gnome. If you use Unity go to dash and search for jockey.

JSonic wrote:Could be the video drivers. Go System Settings - Additional Drivers, if it suggest something, install it.

EDIT That's for Classic Gnome. If you use Unity go to dash and search for jockey.

it's already installed, but it still crashes

ATI and Linux is a possible cause, using packages is also a possible cause.
Try using a self-compiled version.

Unsupported texture format

This is a driver issue