Using the Budgie Welcome, the Steam installer is installed, a screen comes up giving the option to launch it, but after selecting that nothing happens. A generic Steam.desktop icon is on the desktop. Trying to run Steam from the terminal gives me:
Repairing installation, linking /home/bretaa/.steam/steam to /home/bretaa/.local/share/Steam
Running Steam on ubuntu 18.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0)
/home/[my directory]/.local/share/Steam/ubuntu12_32/steam: symbol lookup error: /usr/lib/i386-linux-gnu/libxcb-dri3.so.0: undefined symbol: xcb_send_request_with_fds
/home/[my directory]/.local/share/Steam/steam.sh: line 444: no match: ssfn*
I think something similar happened to me in Beta 1 as well.
Had a quick google for “symbol lookup error: /usr/lib/i386-linux-gnu/libxcb-dri3.so.0: undefined symbol: xcb_send_request_with_fds” and there are various reports over the years.
At the moment it appears the snap route is the favoured way forward. But can be installed right at the moment via flatpak according to that bug report.
Think probably the best way forward is to remove the option for Steam installation via budgie-welcome until this is resolved. Can add it later once the snap is better defined.
Always, steam being sabotaged. Since 14.04, steam has worked then on the update someone changes a dependent file version to corrupt install or prevent execution. To whoever it is, please stop.