fixing a string issue and tell it to install the package

manifests/unattended_upgrades.pp

@@ -1,10 +1,11 @@
 class apt::unattended_upgrades {
-  package{'unattended-upgrades': }
+  package{'unattended-upgrades': ensure => present }
+
   config_file {
       "/etc/apt/apt.conf.d/unattended_upgrades":
-        content => "APT::Periodic::Update-Package-Lists "1";
+        content => 'APT::Periodic::Update-Package-Lists "1";
 APT::Periodic::Unattended-Upgrade "1";
-",
+',
         before => File[apt_config],
         require => Package['unattended-upgrades'],
     }