MozillaVPN GUI doesn't display anything on Ubuntu

[Skit5]

Describe the bug The window is opening but nothing gets displayed

VPN version: 2.25.0

Affected Platforms: Ubuntu 24.04

Steps to reproduce: I followed the standard installation, added the ppa, opened the vpn through the terminal (and also the apps); same result.

Expected result: A properly working GUI that I can see and click on

Actual result: The window opens but displays what was in the background when it opened (persist if you drag the window)

Additional notes: This might be similar to this issue

It is to be noted that this is an old Ubuntu that might have 10-12 years and has known a lot of previous releases.

Debug logs:

export G_MESSAGES_DEBUG=all
export QT_LOGGING_RULES="*=true"
mozillavpn
dbus.parser: Invalid D-BUS member name 'power-saver-enabled' found in interface 'org.freedesktop.portal.PowerProfileMonitor' while parsing introspection
(process:284127): GLib-GIO-DEBUG: 07:12:08.413: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
(process:284127): GLib-GIO-DEBUG: 07:12:08.416: GTask secret_service_async_initable_init_async (source object: 0x574cff1890c0, source tag: 0x77832a7e3660) finalized without ever returning (using g_task_return_*()). This potentially indicates a bug in the program.
(mozillavpn:284127): GLib-DEBUG: 07:12:08.469: unsetenv() is not thread-safe and should not be used after threads are created
(mozillavpn:284127): GLib-GIO-DEBUG: 07:12:08.473: _g_io_module_get_default: Found default implementation gvfs (GDaemonVfs) for ‘gio-vfs’
(mozillavpn:284127): GLib-GIO-DEBUG: 07:12:08.541: _g_io_module_get_default: Found default implementation dconf (DConfSettingsBackend) for ‘gsettings-backend’
(mozillavpn:284127): dconf-DEBUG: 07:12:08.541: watch_fast: "/system/proxy/" (establishing: 0, active: 0)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.541: watch_fast: "/system/proxy/http/" (establishing: 0, active: 0)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.541: watch_fast: "/system/proxy/https/" (establishing: 0, active: 0)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.541: watch_fast: "/system/proxy/ftp/" (establishing: 0, active: 0)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.541: watch_fast: "/system/proxy/socks/" (establishing: 0, active: 0)
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541: px_config_sysconfig_set_config_file: Could not read file /etc/sysconfig/proxy
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541: Active config plugins:
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541:  - config-env
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541:  - config-kde
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541:  - config-gnome
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.541:  - config-sysconfig
(mozillavpn:284127): GLib-GIO-DEBUG: 07:12:08.542: Failed to initialize portal (GNetworkMonitorPortal) for gio-network-monitor: Not using portals
(mozillavpn:284127): GLib-GIO-DEBUG: 07:12:08.543: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.543: watch_established: "/system/proxy/" (establishing: 1)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.543: watch_established: "/system/proxy/http/" (establishing: 1)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.543: watch_established: "/system/proxy/https/" (establishing: 1)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.543: watch_established: "/system/proxy/ftp/" (establishing: 1)
(mozillavpn:284127): dconf-DEBUG: 07:12:08.543: watch_established: "/system/proxy/socks/" (establishing: 1)
(mozillavpn:284127): GLib-GIO-DEBUG: 07:12:08.546: _g_io_module_get_default: Found default implementation networkmanager (GNetworkMonitorNM) for ‘gio-network-monitor’
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.546: px_manager_constructed: Up and running
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.546: px_manager_get_proxies_sync: url=udp://:0 online=1
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.546: px_manager_get_proxies_sync: Proxy[0] = direct://
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.547: px_manager_get_proxies_sync: url=udp: online=1
(mozillavpn:284127): pxbackend-DEBUG: 07:12:08.547: px_manager_get_proxies_sync: Proxy[0] = direct://