title: Command failed when running ghost start
body: <p>Fresh install, trying to run <code>ghost start</code> I get the following error:</p>
  
  <pre><code>Debug Information:
      OS: Raspbian, v8.0
      Node Version: v6.13.0
      Ghost-CLI Version: 1.5.2
      Environment: production
      Command: 'ghost start'
  An error occurred.
  Message: 'Command failed: /bin/sh -c systemctl is-active ghost_blog-dev
  
  unknown
  '
  
  Stack: Error: Command failed: /bin/sh -c systemctl is-active ghost_blog-dev
  
  unknown
  
      at makeError (/usr/lib/node_modules/ghost-cli/node_modules/execa/index.js:169:9)
      at module.exports.sync (/usr/lib/node_modules/ghost-cli/node_modules/execa/index.js:338:15)
      at handleShell (/usr/lib/node_modules/ghost-cli/node_modules/execa/index.js:116:9)
      at Function.module.exports.shellSync (/usr/lib/node_modules/ghost-cli/node_modules/execa/index.js:361:43)
      at SystemdProcessManager.isRunning (/usr/lib/node_modules/ghost-cli/extensions/systemd/systemd.js:88:19)
      at Instance.running (/usr/lib/node_modules/ghost-cli/lib/instance.js:120:34)
      at StartCommand.run (/usr/lib/node_modules/ghost-cli/lib/commands/start.js:28:22)
      at precheck.then (/usr/lib/node_modules/ghost-cli/lib/command.js:159:52)
      at process._tickCallback (internal/process/next_tick.js:109:7)
      at Module.runMain (module.js:613:11)
      at run (bootstrap_node.js:387:7)
      at startup (bootstrap_node.js:153:9)
      at bootstrap_node.js:500:3
  Code: 3
  </code></pre>
  
  <p>If I manually run the command that is says failed it seems to execute without error though I am not sure what it does.  I assume it has something to do with checking with nginx if ghost has actually started or not.  </p>
  
  <p>Any suggestions would be very helpful!  Thank you!</p>