fix linux_distrib_codename to linux_system_codename
diff --git a/linux/system/repo-local/ubuntu-liberty.yml b/linux/system/repo-local/ubuntu-liberty.yml
index b06c31a..9f2c365 100644
--- a/linux/system/repo-local/ubuntu-liberty.yml
+++ b/linux/system/repo-local/ubuntu-liberty.yml
@@ -4,7 +4,7 @@
       repo:
         cloudarchive:
           refresh_db: ${_param:linux_repo_refresh_db}
-          source: "deb [arch=amd64] http://${_param:local_repo_url}/${_param:linux_distrib_codename}/ nightly liberty"
+          source: "deb [arch=amd64] http://${_param:local_repo_url}/${_param:linux_system_codename}/ nightly liberty"
           architectures: amd64
           default: true
           key_url: "http://${_param:local_repo_url}/public.gpg"