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Signal Setup

update Debian's package index

sudo apt update && sudo apt upgrade

install the Initial Required Packages For Signal Installation

sudo apt install dirmngr ca-certificates software-properties-common apt-transport-https curl --no-install-recommends

download Signal Desktop APT Repository

curl -fsSL https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor | sudo tee /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null

import the APT repository

echo "deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main" | sudo tee /etc/apt/sources.list.d/signal-desktop.list

update to reflect the new additional repository

sudo apt update

install Signal package from Debian's APT repository

sudo apt install signal-desktop --no-install-recommends

check the Signal version

signal --version

Cleanup

first, remove the Signal Desktop application using the following command

sudo apt remove signal-desktop

remove the repository using the following command

sudo rm /etc/apt/sources.list.d/signal-desktop.list

remove the GPG key as follows

sudo rm /usr/share/keyrings/signal-desktop-keyring.gpg