Riot

echo "deb https://riot.im/packages/debian/ $(lsb_release -s -c) main" | sudo tee /etc/apt/sources.list.d/matrix-riot-im.list; curl -L https://riot.im/packages/debian/repo-key.asc | sudo apt-key add -; sudo apt-get update; sudo apt-get -y install riot-web

• https://about.riot.im/
• https://github.com/vector-im/riot-web/issues/2845#issuecomment-269720886