It should NEVER be more than 1 line of shell or 2 mouse clicks to install anything. This is 2022, not 1995.
It's faster to just search for "signal" in the snap store and hit "Install".
No way. I will never trust your binary.
There are a lot of users that prefer the established trust model of a Linux distribution. They're willing to trust the mostly unpaid debian maintainers for example... but not John Doe, the temporarily set back billionaire who's just about to make it big
wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop-keyring.gpg && cat signal-desktop-keyring.gpg | sudo tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null && echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' |\ sudo tee -a /etc/apt/sources.list.d/signal-xenial.list && sudo apt update && sudo apt install signal-desktop
This is also one of my fears with pushing non tech savvy people away from Apple/Windows and onto Linux without the Snap, Flathub, or other such curated stores that ship with the distro, without which they would need to touch the terminal and run commands found on the internet.
GNU/Geeks will keep shouting religiously how insecure Windows is because "grandma can download a dodgy .exe pretending to be a game and get viruses", but on Linux it's the same shit or worse, all you have to do is to convince a user new to Linux to paste and run a sudo command in the terminal as instructed by some scammy tutorial he found on Youtube when searching for "how to install Fortnite on Linux" and it's game over for him, since Youtube removed the downvote counter and the user had no idea he was running into a trap.
After all, for most Average Joes, copying some text feels far less dangerous than downloading and opening a strange file.
At least Windows Defender will most likely catch that malware you downloaded and warn you about it being harmful, but on Linux you have no such guardian nanny to save you. With sudo, it will do whatever self-destructive thing you tell it to do and not complain.
curl -sfL www.marginalia.nu/install.sh | sudo sh -
Or cloning a git repo and building it?
But you can?
With .deb-files you're expected to verify the checksum. Maybe you don't, and even if you don't, you can theoretically go back and verify after as part of a forensic process. This checksum is also typically distributed across different mirrors, making bait-and-switch attacks difficult. It means that if you're going to do a supply chain attack, you must do it in the open.
Compiling from sources is a bit sketchy, but it is also the vector that is easiest to analyze, so I think they cancel out.
Is it really meaningfully easier to analyse? I get that it feels better, but I'd bet that the people saying this would fail to catch the backdoor every time.
I would instead manually download and unpack the app, create separate user for it, and run it in chroot. Much safer than your method.
Sadly, plenty of applications still take the old "apt-key" approach of adding the keys globally (e.g., installing keys to /etc/apt/trusted.gpg.d), but I think Signal's installation process is the correct/recommended approach for distributing apt packages securely.
Sadly debian-based distributions do not respect the principle of least privileges and grant unnecessary permissions to installation scripts.
If it is critical or has the potential to compromise security, it should take however many lines that are required to ensure a safe installation. The landscape today is far too complex to expect simple deployments (one liners) to be safe. A few extra lines is a small tradeoff in that case. I shudder when I see curl|bash type installations being normalized.