Error message received in console:
/home/dsnettleton/.local/share/Steam/SteamApps/common/Team Fortress 2 Beta/hl2.sh: line 72: 18883 Segmentation fault (core dumped) ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"
Game removed: AppID 520 "Team Fortress 2 Beta", ProcID 18877

It should be noted that I have an NVidia optimus graphics card, so I'm launching the game with the launch option:
"$OPTIMUS_PREFIX %command%"

Hardware detection according to Steam, which is launched without the optimus prefix, is below.

Processor Information:
Vendor: GenuineIntel
Speed: 2301 Mhz
8 logical processors
4 physical processors
HyperThreading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported

Network Information:
Network Speed:

Operating System Version:
Ubuntu 12.10 (64 bit)
Kernel Name: Linux
Kernel Version: 3.5.0-25-generic
X Server Vendor: The X.Org Foundation
X Server Release: 11300000
X Window Manager: Compiz
Steam Runtime Version: steam-runtime-release-i386_2013-02-22

Video Card:
Driver: Intel Open Source Technology Center Mesa DRI Intel(R) Sandybridge Mobile x86/MMX/SSE2

Driver Version:  3.0 Mesa 9.0.2
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
VendorID:  0x10de
DeviceID:  0xdcd
Number of Monitors:  1
Number of Logical Video Cards:  2
Primary Display Resolution:  1600 x 900
Desktop Resolution: 1600 x 900
Primary Display Size: 15.04" x 8.46"  (17.24" diag)
                                        38.2cm x 21.5cm  (43.8cm diag)
Primary VRAM Not Detected

Sound card:
Audio device: Intel CougarPoint HDMI

Memory:
RAM: 7880 Mb

Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 430083 Mb
Largest Free Hard Disk Block: 176655 Mb

Installed software:

Recent Failure Reports:
Sun Feb 24 19:24:07 2013 GMT: file ''/tmp/dumps/assert_20130224142359_1.dmp'', upload yes: ''CrashID=bp-eb158b4f-1f2c-48c2-ad22-3a6232130224''
Sun Feb 24 23:39:59 2013 GMT: file ''/tmp/dumps/assert_20130224183959_1.dmp'', upload no: ''Couldn't resolve host name''