Hello @3rased, swrast is mesa's slower cpu opengl renderer and the fact Steam is trying to use it and failing hints that you're using the nVidia proprietary driver, but don't have nVidia's 32 bit userspace installed.
Can you check what driver series you have installed, then check if the 32 bit userspace is installed with something like apt policy libnvidia-gl-450:i386? (Change 450 to match the version that is installed.) If it's not installed, you can run something like sudo apt install libnvidia-gl-450:i386 to add it to your system.
that did it, thanks!
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Your system information
Please describe your issue in as much detail as possible:
Steam doesn't launch on a newly installed Ubuntu 20.10
Steps for reproducing this issue:
-1.
$ wget http://media.steampowered.com/client/installer/steam.deb
-2.
$ sudo apt-get install gdebi-core
-3.
$ sudo gdebi steam.deb
-4.
$ steam