Comment 3 for bug 1849478

Starting from Ubuntu 21.04 the pipewire libs are bundled in Ubuntu itself, to allow screen sharing over webrtc. This allows Firefox to cast screen properly, which is great :)

However, since the Chromium snap is missing the pipewire support (currently 90.0.4430.85), it's not possible to set the flag chrome://flags/#enable-webrtc-pipewire-capturer to true, which effectively disables screen sharing on Chromium.