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Signal AppImage now officially available for Linux
(aboutsignal.com)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
Flatpaks can be unsafe too though.
I still prefer repositories, but official AppImages beat unofficial downloads.
Same goes for .debs from Debian stable. There is no absolute safety. But downloading unsigned code from a random website is far down the safe list.
AppImage defended and used grossly outdated core component like FUSE2 for a long time, and comes with zero sandboxing by default.
IMO, flatpak needs to improve in terms of security, but it is a strict improvement over AppImage.