bug#53134: org.signal.Signal on flatpak can't execvp xdg-settings

[John Kehayias]

Hello,

I use Signal through Flatpak on a Guix System without any issues. I can't say I 
have seen this error before. Some general pointers about Flatpak (on Guix at 
least):

1. Applications should be installed as a user, i.e. with flatpak --user I don't 
think running them it makes a difference specifying, and probably you would 
have run into an error or suggestion from flatpak telling you to use --user.

2. To interact with the system (Flatpak is a sandbox) you will likely need an 
xdg-desktop-portal, probably xdg-desktop-portal-gtk or xdg-desktop-portal-wlr 
(for Wayland, not sure how the setup for that works though)

3. The first warning you see can be rectified by adding the second path (the 
first won't exist on Guix Systems) to XDG_DATA_DIRS as it notes (in your 
.profile or similar), or you can use the script provided by the package in your 
profile's etc/profile.d/flatpak.sh (I don't think Guix automatically uses 
scripts in etc/profile.d unlike other distros)

Hope that helps! If you can provide other info like how you installed Signal, 
guix describe, and so on, that may help too.

John