1. Install the GPG key $ wget -qO - https://download.sublimetext.com/sublimehq-pub.gpg | sudo apt-key add - 2. Ensure apt is set up to work with https sources: $ sudo apt install apt-transport-https 3. Select the channel to use: Stable echo "deb https://download.sublimetext.com/ apt/stable/" | sudo tee /etc/apt/sources.list.d/sublime-text.list 4. Update apt sources and install Sublime Text $ sud..