Here we keep need to keep going and only display an error, otherwise the rest of the file ain't properly cleaned up

src/yunohost/app.py

@@ -931,7 +931,11 @@ def app_install(operation_logger, app, label=None, args=None, no_remove_on_failu
                     logger.warning(msg)
                     operation_logger_remove.error(msg)
                 else:
+                    try:
                         _assert_system_is_sane_for_app(manifest, "post")
+                    except Exception as e:
+                        operation_logger_remove.error(e)
+                    else:
                         operation_logger_remove.success()
 
             # Clean tmp folders