Pulse Audio under Ubuntu 9.04 can cause strange crashes when running TF2 under CXGames 7.2
The best solution is to remove pulse audio and configure your Ubuntu Sound settings (System - > Preferences -> Sound) to use Alsa or OSS. Alsa is prefered. It is also a good idea to set your CXGames bottle settings to match the Audio settings in the Ubuntu sound config tool. Specifically under "Bottle Settings" tab set "sound drive load order" to what you configured above. Under the Control Panel Tab, open Winecfg, click the Audio tab and set the sound system to match what is configured in the Ubuntu sound config tool.
Remove pulseaudio by running: sudo apt-get purge pulseaudio
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