Screencast interface missing

Thank you for taking the time to report this bug and helping to make Ubuntu better.

Note that this requires pipewire support to be enabled in mutter and xdg-desktop-portal, which are both in main, which then means pipewire needs to be in main (see bug 1802533). I believe this is what is blocking https://salsa.debian.org/debian/xdg-desktop-portal/-/blob/debian/master/debian/rules#L8 from being set to --enable-pipewire.

Also note that pipewire 0.3 is needed for GNOME Shell 3.36, which isn't packaged in Debian or Ubuntu yet ( see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954022 ).

Once these are sorted then I guess potentially -Dremote_desktop=false could be set to true here as well https://salsa.debian.org/gnome-team/mutter/-/blob/debian/master/debian/rules#L33

The build without `org.freedesktop.portal.ScreenCast` prevents e.g. Chrome/Chromium to share the desktop through MS teams when using Wayland, e.g. like it works on Fedora (https://uwot.eu/blog/microsoft-teams-on-fedora-and-wayland-with-screenshare/).

Chromimm output:

[110445:110445:1013/141808.679718:ERROR:base_capturer_pipewire.cc(517)] Failed to create a screen cast session: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.ScreenCast” on object at path /org/freedesktop/portal/desktop

I can confirm this is a problem in 20.10 as well. Pipewire 0.3 is available but apps (eg Chromium via snap and Chrome via deb) cannot acquire outputs to share with the error Claudio pasted above.

We need an update on this issue.

The fact that there has not been any progress posted in this thread is very disconcerting.

The option to be enabled would require pipewire to be moved to main (the list of officially supported packaged), it's waiting for a security review at the moment
https://bugs.launchpad.net/ubuntu/+source/pipewire/+bug/1802533

The issue has been considered lower priority because pipewire is still not considered stable nor tested enough to be default and most of Ubuntu users are on x11 which doesn't need it.

As stay-at-home request intensifies having screen-sharing capabilities are becoming more important.

The default Ubuntu session is x11 and that has perfectly working screen sharing

This bug was fixed in the package xdg-desktop-portal - 1.8.0-3

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xdg-desktop-portal (1.8.0-3) unstable; urgency=medium

  * debian/rules: Build with pipewire support in ubuntu as well (LP: #1879580)

 -- Marco Trevisan (Treviño) <email address hidden> Thu, 11 Feb 2021 19:08:03 +0100

Do I see that right, that this means for people wanting to use wayland and have working screensharing (which is a kind of important thing to have working right now), are forced to use a non-LTS Ubuntu version 21.04+?

And until the fix for [1] makes it into 21.10, it's basically 21.04 only that's theoretically having a working solution for the criterias:
- wayland
- non-buggy DE
- screenshare

Or will you maybe take into consideration to rebuild xdg-desktop-portal with the needed flags for the Screencast interface for 20.04?

[1]: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1947467