When logging in explicitly though GDM on the first boot after installation, the keyboard layout option at the login screen defaults correctly to UK, and I get UK keyboard layout after login.
If I then restart gdm so that auto-login happens again, I get UK layout in the desktop session again, so it looks like once the setting is established, it persists.
If I remove /var/cache/gdm/yourusername/dmrc and ~/.dmrc, then auto-login again, the layout is US once more. No ~.dmrc appears to be created.
When logging in explicitly though GDM on the first boot after installation, the keyboard layout option at the login screen defaults correctly to UK, and I get UK keyboard layout after login.
If I then restart gdm so that auto-login happens again, I get UK layout in the desktop session again, so it looks like once the setting is established, it persists.
If I remove /var/cache/ gdm/yourusernam e/dmrc and ~/.dmrc, then auto-login again, the layout is US once more. No ~.dmrc appears to be created.