Steam beta moves Linux client to 64-bit
The update also adds a dedicated runtime container and achievement groups, but Linux users still need 32-bit libraries and graphics drivers.

Valve has introduced a 64-bit main application for Steam on Linux through a Steam Client Beta update. The change replaces the 32-bit main program previously used even on 64-bit Linux distributions, although it does not eliminate all 32-bit requirements.
Users still need 32-bit libraries and graphics drivers for compatibility. Valve said Linux systems restricted to 64-bit software are not yet supported. Some Steam components, including steamwebhelper, were already running as 64-bit software before the main application's transition.
The beta also places the client in a dedicated Steam Runtime container, a change intended to make its behavior more consistent across Linux distributions. Steam games use the same technology and can run 32-bit or 64-bit code independently of the client's architecture.
Another addition, Steam Achievement Sets, lets achievements be grouped across a base game and its downloadable content. The feature is also intended to let developers offer seasonal goals. Left 4 Dead 2 and Portal 2 are among the games already supporting it in beta.




