work on chroot bootstrap issues (take 4)

manifests/chroot.pp

@@ -106,7 +106,7 @@ define su_debuild::chroot(
       command => "chroot $path apt-get update; chroot $path apt-get install stanford-keyring",
       creates => "$path/usr/share/keyrings/stanford-keyring.gpg",
       require => [
-        Exec['copy-correct-sources-list'],
+        Exec["copy-correct-sources-list-{$name}"],
         File["${path}/etc/apt/trusted.gpg.d/stanford-keyring.gpg"],
       ]
     }