[Bug]: Can't find module 'dconf' specified in GSETTINGS_BACKEND

[peterlobster]

Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.
• If this is an issue with a particular app, I have tried filing it in the appropriate issue tracker for the app (e.g. under https://github.com/flathub/) and determined that it is an issue with Flatpak itself.
• This issue is not a report of a security vulnerability (see here if you need to report a security issue).

Flatpak version

1.14.1

What Linux distribution are you using?

Gentoo Linux

Linux distribution version

6.1.0-gentoo

What architecture are you using?

x86_64

How to reproduce

Run anything with flatpak run --verbose ...

Expected Behavior

No errors

Actual Behavior

All applications report a similar error to Can't find module 'dconf' specified in GSETTINGS_BACKEND

Additional Information

Ref: https://bugs.gentoo.org/878043

It was reported by another Gentoo user that this can be fixed by setting GSETTINGS_BACKEND=keyfile globally with Flatseal. Seems to be influenced by: https://blogs.gnome.org/mclasen/2019/07/12/settings-in-a-sandbox-world/. It's unclear though if this is the correct fix.

[chrisawi]

GSETTINGS_BACKEND could reasonably be added to the list in flatpak-run.c to be excluded, but there's no real reason for it to be set in the first place.

https://gitweb.gentoo.org/repo/gentoo.git/tree/gnome-base/dconf/dconf-0.40.0.ebuild#n50

This whole scheme was unnecessary because the dconf gio module has a higher priority than the gconf one. They should never have set that variable in the first place. gconf has been retired from Gentoo, so they should be able to just drop the whole thing now.