Bug 514689

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SUMMARY
After a fresh installation from Flathub or Snap, I can't start the applications.

STEPS TO REPRODUCE
1. Install from Snap or Flathub
2. Start the application either via command line to desktop environment


OBSERVED RESULT
Application never starts.

EXPECTED RESULT
Application should start.

SOFTWARE/OS VERSIONS
Ubuntu 24.04 LTE

ADDITIONAL INFORMATION
Below is the flatpak run ... output. It might be related that I have custom keyboard layouts on my system. (us-uscustom decustom)
[     0.000 2  ] WARNING   Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.

(process:2): Gtk-WARNING **: 13:12:50.081: Locale not supported by C library.
	Using the fallback 'C' locale.
[     0.072 2 ghostwriter ] WARNING   Qt: Session management error: Could not open network socket
[     0.085 2 ghostwriter ] INFO      Backup files will be stored in "/home/user/.var/app/org.kde.ghostwriter/data/ghostwriter/backups/"
[     0.087 2 ghostwriter ] INFO      Using pandoc version 3.8.3
[     0.088 2 ghostwriter ] INFO      Using multimarkdown version 6.7.0
[     0.088 2 ghostwriter ] INFO      Using cmark version 0.31.1
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
[2:28:0116/131250.409380:ERROR:bus.cc(408)] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
xkbcommon: ERROR: [XKB-661] Couldn't process include statement for 'us(uscustom)'
xkbcommon: ERROR: [XKB-769] Abandoning symbols file "(unnamed map)"
xkbcommon: ERROR: Failed to compile xkb_symbols
xkbcommon: ERROR: [XKB-822] Failed to compile keymap
[2:27:0116/131250.438867:FATAL:xkb_keyboard_layout_engine.cc(661)] Keymap file failed to load: us,de,us-uscustom,decustom,