do not run the urwid loop at all when not interactive

subiquity/core.py

@@ -195,6 +195,7 @@ class Subiquity(TuiApplication):
     def restart(self, remove_last_screen=True):
         if remove_last_screen:
             self._remove_last_screen()
+        if self.urwid_loop is not None:
             self.urwid_loop.screen.stop()
         cmdline = ['snap', 'run', 'subiquity']
         if self.opts.dry_run:
@@ -276,7 +277,9 @@ class Subiquity(TuiApplication):
             await self.load_autoinstall_config()
             if not self.interactive() and not self.opts.dry_run:
                 open('/run/casper-no-prompt', 'w').close()
-        await super().start()
+        await super().start(start_urwid=self.interactive())
+        if not self.interactive():
+            self.select_initial_screen(0)
 
     def extra_urwid_loop_args(self):
         return dict(input_filter=self.input_filter.filter)

subiquitycore/tui.py

@@ -267,8 +267,9 @@ class TuiApplication(Application):
                 controller_index = i
         return controller_index
 
-    async def start(self):
+    async def start(self, start_urwid=True):
         await super().start()
+        if start_urwid:
             self.start_urwid()
 
     def run(self):