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I have steam installed on Ubuntu 13.04 with Garrys Mod, downloaded. When i try to launch the game, it returns with an error " Could not load library content (Unknown error)". Team Fortress 2 seems to work just fine. The graphics are Intel Core i5 intergrated graphics (Sandy Bridge). Tried to reinstall the game, that didnt work.

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You're probably using a 64bit system, but you need 32bit libs:

sudo apt-get install ia32-libs-multiarch

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