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-get install apt-transport-https
3. Select the channel to use:
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
sudo apt-get update sudo apt-get install sublime-text