Ghost install fails

[Fastidious]

Running ghost doctor after a problem installing (Ghost with sqlite), I get:

david@quark:/var/www/ghost$ ghost doctor
✔ Checking system Node.js version
✔ Checking logged in user
✔ Ensuring user is not logged in as ghost user
✔ Checking if logged in user is directory owner
✔ Checking current folder permissions
System checks failed with message: 'Linux version is not Ubuntu 16'
Some features of Ghost-CLI may not work without additional configuration.
For local installs we recommend using `ghost install local` instead.
? Continue anyway? Yes
ℹ Checking operating system compatibility [skipped]
Running sudo command: systemctl is-active ghost_localhost
? Password [input is hidden]

What password is the one being asked?

[acburdine]

The password that's being asked is your sudo password - I can update the prompt to be a bit more clear.