Legend of Grimrock crashes on opening

Ubuntu 12.04 Legend of Grimrock briefly shows a loading screen then crashes.

Error log: (internal #67292)

GL_VERSION: 3.0 Mesa 8.0.4
GL_VENDOR: Tungsten Graphics, Inc
GL_RENDERER: Mesa DRI Intel(R) Ivybridge Mobile
GL_SHADING_LANGUAGE_VERSION: 1.30
GL_EXTENSIONS: GL_ARB_multisample GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_copy_texture GL_EXT_polygon_offset GL_EXT_subtexture GL_EXT_texture_object GL_EXT_vertex_array GL_EXT_compiled_vertex_array GL_EXT_texture GL_EXT_texture3D GL_IBM_rasterpos_clip GL_ARB_point_parameters GL_EXT_draw_range_elements GL_EXT_packed_pixels GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_separate_specular_color GL_EXT_texture_edge_clamp GL_SGIS_generate_mipmap GL_SGIS_texture_border_clamp GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_ARB_framebuffer_sRGB GL_ARB_multitexture GL_EXT_framebuffer_sRGB GL_IBM_multimode_draw_arrays GL_IBM_texture_mirrored_repeat GL_3DFX_texture_compression_FXT1 GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_transpose_matrix GL_EXT_blend_func_separate GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_secondary_color GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod_bias GL_INGR_blend_func_separate GL_NV_blend_square GL_NV_light_max_exponent GL_NV_texgen_reflection GL_NV_texture_env_combine4 GL_SUN_multi_draw_arrays GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_EXT_framebuffer_object GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_MESA_window_pos GL_NV_packed_depth_stencil GL_NV_texture_rectangle GL_NV_vertex_program GL_ARB_depth_texture GL_ARB_occlusion_query GL_ARB_shadow GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_window_pos GL_ATI_envmap_bumpmap GL_EXT_stencil_two_side GL_EXT_texture_cube_map GL_NV_depth_clamp GL_NV_vertex_program1_1 GL_APPLE_packed_pixels GL_APPLE_vertex_array_object GL_ARB_draw_buffers GL_ARB_fragment_program GL_ARB_fragment_shader GL_ARB_shader_objects GL_ARB_vertex_program GL_ARB_vertex_shader GL_ATI_draw_buffers GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_MESA_pack_invert GL_MESA_ycbcr_texture GL_ARB_depth_clamp GL_ARB_fragment_program_shadow GL_ARB_half_float_pixel GL_ARB_point_sprite GL_ARB_shading_language_100 GL_ARB_sync GL_ARB_texture_non_power_of_two GL_ARB_vertex_buffer_object GL_ATI_blend_equation_separate GL_EXT_blend_equation_separate GL_OES_read_format GL_ARB_color_buffer_float GL_ARB_pixel_buffer_object GL_ARB_texture_compression_rgtc GL_ARB_texture_float GL_ARB_texture_rectangle GL_EXT_packed_float GL_EXT_pixel_buffer_object GL_EXT_texture_compression_rgtc GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_shared_exponent GL_ARB_framebuffer_object GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_packed_depth_stencil GL_APPLE_object_purgeable GL_ARB_vertex_array_object GL_ATI_separate_stencil GL_EXT_draw_buffers2 GL_EXT_gpu_program_parameters GL_EXT_texture_array GL_EXT_texture_integer GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_OES_EGL_image GL_MESA_texture_array GL_ARB_copy_buffer GL_ARB_depth_buffer_float GL_ARB_half_float_vertex GL_ARB_map_buffer_range GL_ARB_texture_rg GL_ARB_texture_swizzle GL_ARB_vertex_array_bgra GL_EXT_separate_shader_objects GL_EXT_texture_swizzle GL_EXT_vertex_array_bgra GL_NV_conditional_render GL_ARB_ES2_compatibility GL_ARB_draw_elements_base_vertex GL_ARB_explicit_attrib_location GL_ARB_fragment_coord_conventions GL_ARB_provoking_vertex GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_shader_texture_lod GL_EXT_provoking_vertex GL_EXT_texture_snorm GL_MESA_texture_signed_rgba GL_ARB_robustness GL_EXT_transform_feedback
GL_STENCIL_BITS: 8
GL_MAX_VERTEX_UNIFORM_COMPONENTS: 16384
GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT: 16.000000
Compiling shader shaders/gl/PostProcess.vsh
Compiling shader shaders/gl/PostProcess.fsh
Compiling shader shaders/gl/ImmediateMode.vsh
Compiling shader shaders/gl/ImmediateMode.fsh
Compiling shader shaders/gl/ImmediateModeTex.vsh
Compiling shader shaders/gl/ImmediateModeTex.fsh
Compiling shader shaders/gl/ParticleSystem.vsh
CompTitle: Software Failure, Error: [string "CustomMaterials.lua"]:0: GL error: glCompressedTexImage2D failed (GL_INVALID_ENUM 0x0500)
stack traceback:
 [C]: in function 'load'
 [string "CustomMaterials.lua"]: in function 'create'
 [string "Grimrock.lua"]: in function 'init'
 [string "Grimrock.lua"]: in main chunk
 [C]: in function 'require'
 init.lua: in main chunk

An error log has been written to:
/home/duncan/.local/share/Almost Human/Legend of Grimrock/error.log

Please email this file to <email address hidden>

iling shader shaders/gl/ParticleSystem.fsh
Compiling shader shaders/gl/NotebookRenderer.vsh
Compiling shader shaders/gl/NotebookRenderer.vsh
Compiling shader shaders/gl/NotebookRenderer.vsh
Compiling shader shaders/gl/NotebookRenderer.vsh
Compiling shader shaders/gl/NotebookRenderer.fsh
Compiling shader shaders/gl/NotebookRenderer.fsh
Compiling shader shaders/gl/NotebookRendererUnlit.fsh
Compiling shader assets/shaders/gl/crystal.vsh
Compiling shader assets/shaders/gl/crystal.vsh
Compiling shader assets/shaders/gl/crystal.vsh
Compiling shader assets/shaders/gl/crystal.vsh
Compiling shader shaders/gl/MeshGeometry.fsh
Compiling shader shaders/gl/MeshGeometry.fsh
Compiling shader shaders/gl/MeshGeometry.fsh
Compiling shader shaders/gl/MeshGeometry.fsh
Compiling shader assets/shaders/gl/crystal.fsh
Compiling shader assets/shaders/gl/crystal_unlit.fsh
Compiling shader shaders/gl/MeshShadow.fsh
Compiling shader shaders/gl/MeshShadow.fsh
AL lib: ALc.c:1879: exit(): closing 1 Device
AL lib: ALc.c:1808: alcCloseDevice(): destroying 1 Context(s)