Build & Run fails with the tutorial app

[andrewebdev]

Hey, I'm having an issue with the Beeware Tutorial, during the briefcase build & run steps. Build looks like it's successful, but soon as I try to run the AppImage or briefcase run I get errors. See snippet below:

            .-/+oossssoo+/-.               andre@andre-office 
        `:+ssssssssssssssssss+:`           ------------------ 
      -+ssssssssssssssssssyyssss+-         OS: Ubuntu 20.04.4 LTS x86_64 
    .ossssssssssssssssssdMMMNysssso.       Host: Z68AP-D3 
   /ssssssssssshdmmNNmmyNMMMMhssssss/      Kernel: 5.4.0-107-generic 
  +ssssssssshmydMMMMMMMNddddyssssssss+     Uptime: 2 hours, 31 mins 
 /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/    Packages: 2731 (dpkg), 42 (snap) 
.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Shell: zsh 5.8 
+sssshhhyNMMNyssssssssssssyNMMMysssssss+   Resolution: 1920x1080, 1080x1920 
ossyNMMMNyMMhsssssssssssssshmmmhssssssso   WM: i3 
ossyNMMMNyMMhsssssssssssssshmmmhssssssso   Theme: Breeze [GTK2/3] 
+sssshhhyNMMNyssssssssssssyNMMMysssssss+   Icons: breeze [GTK2/3] 
.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Terminal: gnome-terminal 
 /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/    CPU: Intel i5-2500K (4) @ 3.700GHz 
  +sssssssssdmydMMMMMMMMddddyssssssss+     GPU: NVIDIA GeForce GTX 760 
   /ssssssssssshdmNNNNmyNMMMMhssssss/      Memory: 3530MiB / 15991MiB 
    .ossssssssssssssssssdMMMNysssso.
      -+sssssssssssssssssyyyssss+-                                 
        `:+ssssssssssssssssss+:`
            .-/+oossssoo+/-.



(venv) ╭─andre@andre-office ~/dev/studies/beeware/helloworld 
╰─$ briefcase run  

[helloworld] Starting app...


** (__main__.py:110409): WARNING **: 11:59:57.761: Failed to load shared library 'libgtk-3.so.0' referenced by the typelib: /lib/x86_64-linux-gnu/libgtk-3.so.0: undefined symbol: g_mount_operation_set_is_tcrypt_hidden_volume
Traceback (most recent call last):
  File "/tmp/.mount_Hello_dNnTJk/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/tmp/.mount_Hello_dNnTJk/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/tmp/.mount_Hello_dNnTJk/usr/app/helloworld/__main__.py", line 4, in <module>
    main().main_loop()
  File "/tmp/.mount_Hello_dNnTJk/usr/app/helloworld/app.py", line 49, in main
    return HelloWorld()
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga/app.py", line 272, in __init__
    self.factory = get_platform_factory(factory)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga/platform.py", line 41, in get_platform_factory
    from toga_gtk import factory
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga_gtk/factory.py", line 1, in <module>
    from .app import App, DocumentApp, MainWindow
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga_gtk/app.py", line 13, in <module>
    from .keys import gtk_accel
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga_gtk/keys.py", line 3, in <module>
    from .libs import Gdk
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga_gtk/libs/__init__.py", line 1, in <module>
    from .gtk import *  # noqa: F401, F403
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/toga_gtk/libs/gtk.py", line 5, in <module>
    from gi.repository import Gtk, Gdk, GdkPixbuf, Gio, GLib, GObject  # noqa: F401, E402
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/importer.py", line 145, in load_module
    dynamic_module = load_overrides(introspection_module)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/overrides/__init__.py", line 118, in load_overrides
    override_mod = importlib.import_module(override_package_name)
  File "/tmp/.mount_Hello_dNnTJk/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/overrides/Gtk.py", line 111, in <module>
    class Widget(Gtk.Widget):
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/module.py", line 168, in __getattr__
    interfaces = tuple(interface for interface in get_interfaces_for_object(info)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/module.py", line 94, in get_interfaces_for_object
    interfaces.append(getattr(module, name))
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/overrides/__init__.py", line 32, in __getattr__
    return getattr(self._introspection_module, name)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/module.py", line 207, in __getattr__
    wrapper = metaclass(name, bases, dict_)
  File "/tmp/.mount_Hello_dNnTJk/usr/app_packages/gi/types.py", line 247, in __init__
    register_interface_info(cls.__info__.get_g_type())
TypeError: must be an interface

Unable to start app helloworld.

[freakboy3742]

Thanks for letting us know. We're tracking a number of issues with Linux packaging at the moment (#631, #679, and others); it's the hardest one to get right, because every Linux installation is a unique snowflake.