# deb [arch=amd64 signed-by=/etc/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main
# deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/signal-keys.asc] https://updates.signal.org/desktop/apt xenial main
# deb-src [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/signal-keys.asc] https://updates.signal.org/desktop/apt xenial main