The missing step from many online articles appears to be the switch to ghost-mgr. After logging into a terminal session; # Update package lists sudo apt-get update # Update installed packages sudo apt-get upgrade *if there is an error (after "apt-get update") downloading from Yarn, run this command: curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add https://github.com/yarnpkg/yarn/issues/7866#issue-558663837 sudo -i -u ghost-mgr cd /var/www/ghost ghost backup s…