It seem that the game is just crashing without any warning or reason but this is the what I got when I used GDB
0xf5a35f8c in ?? () from /usr/lib32/fglrx/dri/fglrx_dri.so
I thought to post it here and in the game's bugzilla.
Here is my system information
Processor Information: Vendor: GenuineIntel Speed: 3801 Mhz 4 logical processors 4 physical processors HyperThreading: Unsupported FCMOV: Supported SSE2: Supported SSE3: Supported SSSE3: Supported SSE4a: Unsupported SSE41: Supported SSE42: Supported Network Information: Network Speed: Operating System Version: Ubuntu 13.04 (64 bit) Kernel Name: Linux Kernel Version: 3.8.0-19-generic X Server Vendor: The X.Org Foundation X Server Release: 11303000 X Window Manager: GNOME Shell Steam Runtime Version: steam-runtime-release-i386_2013-04-16 Video Card: Driver: ATI Technologies Inc. AMD Radeon HD 6800 Series Driver Version: 4.2.12172 Compatibility Profile Context 12.104 Desktop Color Depth: 24 bits per pixel Monitor Refresh Rate: 59 Hz VendorID: 0x1002 DeviceID: 0x6739 Number of Monitors: 1 Number of Logical Video Cards: 1 Primary Display Resolution: 1920 x 1200 Desktop Resolution: 1920 x 1200 Primary Display Size: 20.39" x 12.76" (24.02" diag) 51.8cm x 32.4cm (61.0cm diag) Primary VRAM Not Detected Sound card: Audio device: Intel PantherPoint HDMI Memory: RAM: 7817 Mb Miscellaneous: UI Language: English LANG: en_US.UTF-8 Microphone: Not set Total Hard Disk Space Available: 120059 Mb Largest Free Hard Disk Block: 101497 Mb Installed software: Recent Failure Reports:
BTW It seems that if I connect 2 monitors to graphics card the game crashes a lot faster and more often.