Canonical has seemingly crippled Ubuntu 19.10 for gamers, having removed all 32-bit support from the upcoming OS. Anything requiring 32-bit libraries or packages will not install, causing Valve to abandon Steam support for all Ubuntu releases going forwards.
https://www.notebookcheck.net/Ubuntu-19-10-looks-DOA-for-gamers-with-Valve-dropping-support-for-the-OS.425361.0.html