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Signal on Linux
(lemmy.today)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Or, if you are running one of those distros you could just take the .deb and repackage it for whatever distro you're running. Expecting a project to package for every distro, and then be required to support them for every release is a lot of work. And unfortunately some people have no issues expecting from others, but baulk at the idea of doing it themselves.