Signal only provides a script for .deb based distros on their official website. The flatpak is currently not ideal because it stores encryption keys in plaintext.
The provided link suggests an automated installation in a Ubuntu Distrobox including automated updates. Useful for every distro that does not natively support .deb packages.
I mean, I use the Flatpak, but I have also run into breakage concerning the experimental support, resulting in Signal Desktop no longer being able to start, and me having to track down a GitHub issue with a workaround. I can imagine wanting to run the Distrobox just so you’re closer to a system that the upstream developers actually test with - not so much to avoid running a single command, but to lower risk of breakage.
That’s interesting, Ig it really can break.