TF2 OpenGL error "Could not find required OpenGL entry point 'glGetError'...

[eat like snake]

Kubuntu 12.04
Computer model: Dell Vostro 3550
RAM: 8GB
Processor: Intel i5
Graphics card: AMD Radeon HD 6630M + Intel Integrated graphics

I upgraded to 12.11 beta AMD drivers, but to no avail.

Additionally, Steam client occasionally crashes a few seconds after startup, when ran from terminal/console it gives the following errors:

System startup time: 14.83 seconds
ExecSteamURL: "steam://open/driverhelperready"
/home/wesley/.local/share/Steam/steam.sh: line 287:  8046 Segmentation fault      (core dumped) $DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

[Beelzebud]

I'm using an AMD HD5770 with the 12.11 beta 11 drivers, and I'm also getting this error. I even tried rebuilding my drivers, but it didn't work. I played it last weekend, and it was working fine.

I also have Space Pirates and Zombies, and it plays perfectly.

**Edit: I've tried KDE, Window Maker, and fluxbox. I do not have Unity installed to test it on that, as I use Slackware.

[eat like snake]

Same here. TF2 was working for me earlier, and I also have SPAZ and Osmos running fine.

[hkparker]

Same here. I have a 6970 and today got this message while trying to launch TF2. Worked fine last week, on 12.11 beta drivers as well.

[Logan]

https://github.com/ValveSoftware/steam-for-linux/issues/250

[eat like snake]

I tried the reinstalling my drivers, the error still remains.