When starting Team Fortress 2 the "launching game" popup appears and steam crashes:

Uploading dump (out-of-process) [proxy '']
/tmp/dumps/crash_20130327160825_1.dmp
/home/splizard/Steam/steam.sh: line 704: 15101 Segmentation fault      $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
Finished uploading minidump (out-of-process): success = no
error: HTTP response code said error

System Information:

Processor Information:
    Vendor:  AuthenticAMD
    Speed: 2900 Mhz
    4 logical processors
    4 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Unsupported
    SSE4a:  Supported
    SSE41:  Unsupported
    SSE42:  Unsupported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 12.10 (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.5.0-26-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11300000
    X Window Manager:  Compiz
    Steam Runtime Version:  steam-runtime-release-i386_2013-03-25

Video Card:
    Driver:  ATI Technologies Inc. AMD Radeon HD 6550D

    Driver Version:  4.2.11903 Compatibility Profile Context
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x1002
    DeviceID:  0x9640
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 1920 x 1080
    Primary Display Size: 20.08" x 11.30"  (23.03" diag)
                                            51.0cm x 28.7cm  (58.5cm diag)
    Primary VRAM Not Detected

Sound card:
    Audio device: USB Mixer

Memory:
    RAM:  6959 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_NZ.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  293417 Mb
    Largest Free Hard Disk Block:  60142 Mb

Installed software:

Recent Failure Reports:
    Wed Mar 27 03:03:34 2013 GMT: file ''/tmp/dumps/crash_20130327160333_1.dmp'', upload no: ''HTTP response code said error''
    Wed Mar 27 03:07:17 2013 GMT: file ''/tmp/dumps/crash_20130327160716_1.dmp'', upload no: ''HTTP response code said error''
    Wed Mar 27 03:07:48 2013 GMT: file ''/tmp/dumps/crash_20130327160747_1.dmp'', upload no: ''HTTP response code said error''
    Wed Mar 27 03:08:26 2013 GMT: file ''/tmp/dumps/crash_20130327160825_1.dmp'', upload no: ''HTTP response code said error''