Move /dev umount to cleanup step

api-daemon/provisioner/examples/script/3-debootstrap.py

@@ -691,9 +691,6 @@ GRUB_DISABLE_LINUX_UUID=false
             # Debian cloud images are affected, so who knows.
             os.system("systemctl enable cloud-init.target")
 
-        # Unmount the bound devfs
-        os.system("umount {}/dev".format(temporary_directory))
-
     def cleanup(self):
         """
         cleanup(): Perform any cleanup required due to prepare()/install()
@@ -715,6 +712,9 @@ GRUB_DISABLE_LINUX_UUID=false
         # Set the tempdir we used in the prepare() and install() steps
         temp_dir = "/tmp/target"
 
+        # Unmount the bound devfs
+        os.system("umount {}/dev".format(temporary_directory))
+
         # Use this construct for reversing the list, as the normal reverse() messes with the list
         for volume in list(reversed(self.vm_data["volumes"])):
             dst_volume_name = f"{self.vm_name}_{volume['disk_id']}"