Steam client is now 64bit on Linux via the steam runtime container technology!

Linux SteamRT3 Beta

The Steam for Linux client can now be run inside a Steam Runtime container. This will help the Steam client provide a more consistent experience across multiple distributions. This is the same technology we use for Steam games.
The SteamRT3 beta client is distributed alongside the regular beta client. You can opt-in to the beta client via the 'Use experimental SteamRT3 Steam Client' toggle in Settings->Interface.
The SteamRT3 beta client has been updated to 64 bits.
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Flatpak here. Enabling SteamRT3 made Steam refuse to launch. Just be warned. I had to remove Steam completely and reinstall.

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