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Error

We discovered that you are using the DigitalOcean One-Click install. You need to create a user with regular account privileges and migrate your installation to this user.

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Solution

When you installed Ghost with the DigitalOcean One-Click install you probably set up your Ghost installation as a root user. As of Ghost-CLI 1.5.0, running Ghost commands as root is disallowed. Therefore you will need to migrate your current installation to a new Linux user. Run the following steps as root user to fix it: Add a new user: 
adduser <user>
Add user to sudo group: 
usermod -aG sudo <user>
Now create a new instance file and move to new user location: 
mkdir -p /home/<user>/.ghost/

chown <user>:<user> /home/<user>/.ghost

mv /root/.ghost/config /home/<user>/.ghost/config

chown <user>:<user> /home/<user>/.ghost/config
Next, change into your ghost installation directory (/var/www/ghost/ is default in the DigitOcean One-Click installs) to change the ownership of your installation files: 
cd /var/www/ghost
And then execute this command (might take a while): 
find . -group root -user root -exec chown <user>:<user> {} \;
Last step, Login as new user: 
su - <user>
You can check ghost ls now to see if your installation is still up and running.