Fixed /sbin/nologin shell from Ubuntu.

user/manifests/init.pp

@@ -7,11 +7,22 @@ class user::system {
         mode   => 0755,
         owner  => "root",
         group  => $operatingsystem ? {
-            openbsd => "wheel",
+            "openbsd" => "wheel",
-            default => "root",
+            default   => "root",
         },
     }
 
+    case $operatingsystem {
+        "ubuntu": {
+            file { "/sbin/nologin":
+                ensure => link,
+                target => "/usr/sbin/nologin",
+                owner  => "root",
+                group  => "root",
+            }
+        }
+    }
+
     User {
         require => File["/var/empty"],
     }