Ubuntu 19.10が32bit周りの互換機能を完全廃止するらしいけど
その影響でSteamがUbuntuに対する公式サポートを19.10から停止すると言っている

https://twitter.com/Plagman2/status/1142262103106973698
Ubuntu 19.10 and future releases will not be officially supported by Steam or recommended to our users.
We will evaluate ways to minimize breakage for existing users, but will also switch our focus to a different distribution, currently TBD.
https://twitter.com/5chan_nel (5ch newer account)