diff --git a/labs/stacktrain/distros/ubuntu_16_04_server_amd64.py b/labs/stacktrain/distros/ubuntu_16_04_server_amd64.py
index f5d1b7dc..d87d96ac 100644
--- a/labs/stacktrain/distros/ubuntu_16_04_server_amd64.py
+++ b/labs/stacktrain/distros/ubuntu_16_04_server_amd64.py
@@ -81,8 +81,8 @@ class ISOImage(distro.GenericISOImage):
 
         logger.info("New ISO URL:\n\t%s", self.url)
 
-PRESEED_HOST_DIR = ("http://git.openstack.org/cgit/openstack/training-labs/"
-                    "plain/labs/osbash/lib/osbash/netboot/")
+PRESEED_HOST_DIR = ("https://opendev.org/openstack/training-labs/raw/branch/"
+                     "master/labs/osbash/lib/osbash/netboot/")
 
 PRESEED_URL = {}
 PRESEED_URL['ssh'] = PRESEED_HOST_DIR + "preseed-ssh-v6.cfg"
@@ -92,6 +92,7 @@ PRESEED_URL['all'] = PRESEED_HOST_DIR + "preseed-all-v6.cfg"
 # Arguments for ISO image installer
 _BOOT_ARGS = ("/install/vmlinuz"
               " noapic"
+              " debian-installer/allow_unauthenticated_ssl=true"
               " preseed/url=%s"
               " debian-installer=en_US"
               " auto=true"