Cannot create Drupal site - chown error

[edvardkis]

I'm getting error with both .sh files when I try to create drupal site (my os is ubuntu 14.04). Here is the output after running drush-si.sh:
This will install a site with default values

---

Downloading Drupal 8...
chown: /mnt/files: Operation not permitted
/docker-entrypoint.sh: running /docker-entrypoint-init.d/10-drupal-php.sh
/docker-entrypoint.sh: running /docker-entrypoint-init.d/10-drupal-php.sh
chmod: drupal-8*: No such file or directory
mv: cannot stat 'drupal-8*': No such file or directory
./download_drupal.sh: line 44: cd: /home/iilic/PhpstormProjects/drupal-docker/www/docroot: No such file or directory
mv: cannot stat 'sites/default/default.settings.php': No such file or directory
cp: cannot stat 'sites/default/settings.php': No such file or directory
./download_drupal.sh: line 66: sites/default/settings.php: No such file or directory
Cannot start service php: oci runtime error: container_linux.go:247: starting container process caused "chdir to cwd ("/var/www/html/docroot") set in config.json failed: no such file or directory"
Cannot start service php: oci runtime error: container_linux.go:247: starting container process caused "chdir to cwd ("/var/www/html/docroot") set in config.json failed: no such file or directory"
Cannot start service php: oci runtime error: container_linux.go:247: starting container process caused "chdir to cwd ("/var/www/html/docroot") set in config.json failed: no such file or directory"

Process finished with exit code 0

I cannot figure what kind of permission problem is this?
Thanks!