How do I install Signal in Ubuntu?

Signal is a cross-platform encrypted messaging service developed by the Signal Foundation and Signal Messenger. It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos.

Solution 1:

For all releases of Ubuntu 18.04 and newer:

sudo snap install signal-desktop

Solution 2:

Open your terminal and copy-paste the below command one by one

sudo apt install curl
curl -s https://updates.signal.org/desktop/apt/keys.asc | sudo apt-key add -
echo "deb [arch=amd64] 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

All credit goes to https://websiteforstudents.com/how-to-install-signal-desktop-on-ubuntu-16-04-17-10-18-04/