There are big wishes for Signal to adopt the perfectly working Flatpak.
This will make Signal show up in the verified subsection of Flathub, it will improve trust, allow a central place for bug reports and support and ease maintenance.
Flatpak works on pretty much all Distros, including the ones covered by their current “Linux = Ubuntu” .deb repo.
To make a good decision, we need to have some statistics about who uses which package.
Luckily for me, I’m on an Ubuntu derivative. So
apt upgrade
just does it. Sorry, OP, works for me in my preferred way, I don’t need any flatpacks. Let’s hope once they do one they keep building .debs nonetheless.