Update the Ghost CLI
Some operations such as upgrading Ghost require updating the Ghost CLI. Follow these steps:
$ cd /opt/bitnami/ghost/current
$ sudo npm install ghost-cli
You may see warnings related to package.json during the update process. These warnings can safely be ignored.
TIP: If the npm install command fails, run the following:
$ sudo mv package.json package.json.back $ sudo npm install ghost-cli $ sudo mv package.json.back package.json