title: Example on Electron of theia doesn't run
body: <p>I am trying to run an electron example on theia. Getting following exception. Any help ?</p>
  
  <pre><code>ubuntu@ip-10-164-202-79:~/theia$ yarn run rebuild:electron
  yarn run v1.9.4
  $ theia rebuild:electron
  Processing node-pty
  Processing vscode-nsfw
  Processing find-git-repositories
  ✔ Rebuild Complete
  Done in 4.70s.
  ubuntu@ip-10-164-202-79:~/theia$ cd examples/electron/
  ubuntu@ip-10-164-202-79:~/theia/examples/electron$ yarn run start
  yarn run v1.9.4
  $ theia start
  /home/ubuntu/theia/node_modules/electron/dist/electron: error while loading shared libraries: libXss.so.1: cannot open shared object file: No such file or directory
  Done in 1.39s.
  </code></pre>