echo deb Prosody IM Package Repository $(lsb_release -sc) main | sudo tee -a /etc/apt/sources.list
wget https://prosody.im/files/prosody-debian-packages.key -O- | sudo apt-key add -
sudo apt install lua5.2
curl https://download.jitsi.org/jitsi-key.gpg.key | sudo sh -c 'gpg --dearmor >...