I finally found the string in "Launchpad Translations" (English-UK, gdm template) and made the suggestion for the change above. Assuming the translation fix is taken, then the bug will be fixed.
** Package changed: gdm (Ubuntu) => language-pack-gnome-en (Ubuntu) -- Login screen clock has AM/PM suffix despite 24-hour format https://bugs.launchpad.net/bugs/289868 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs