Unbreak snap screen, and simplify it

subiquity/ui/views/snaplist.py

@@ -413,13 +413,6 @@ class SnapListView(BaseView):
         self._w = screen
 
     def get_seed_yaml(self):
-        log.debug("%r", self.controller.base_model.installpath.sources)
-        sources = list(self.controller.base_model.installpath.sources.values())
-        if len(sources) != 1 or not sources[0].startswith('cp://'):
-            log.warning("cannot parse install sources %r", sources)
-        else:
-            source = sources[0][5:]
-            log.debug("install source %r", source)
         if self.controller.opts.dry_run:
             return '''snaps:
   -
@@ -431,16 +424,14 @@ class SnapListView(BaseView):
     channel: stable/ubuntu-18.04
     file: lxd_59.snap
 '''
-        else:
-            seed_location = os.path.join(
-                source, 'var/lib/snapd/seed/seed.yaml')
-            try:
-                fp = open(seed_location, encoding='utf-8', errors='replace')
-            except FileNotFoundError:
-                log.exception("could not find source at %r", seed_location)
-            with fp:
+        seed_location = '/media/filesystem/var/lib/snapd/seed/seed.yaml'
+        content = ""
+        try:
+            with open(seed_location, encoding='utf-8', errors='replace') as fp:
                 content = fp.read()
-            return content
+        except FileNotFoundError:
+            log.exception("could not find source at %r", seed_location)
+        return content
 
     def get_preinstalled_snaps(self):
         try: