No notification sound (linux desktops, some android phones)

I've no notification sound on incoming chat messages on desktop (Gentoo Linux), while text popup notification works okay.

My friend doesn't have notification sound both on desktop (Ubuntu) and on phone (Android), but do have text notifications on both. (I've notification sound on phone (Android)).

This is very annoying and may become a reason to stop using keybase. :(

May be related to https://github.com/keybase/client/issues/7740 https://github.com/keybase/client/issues/10453 https://github.com/keybase/client/issues/9215

Start by reviewing the related issues #7740, #10453, and #9215, then compare notification behavior on Gentoo Linux, Ubuntu, and Android. Reproduce the missing incoming-chat sound while text notifications still appear; done means notification sound works on the affected platforms without regressing the existing popup.

Written by the indexing model from the issue text.