I think the default login screen uses the US keyboard layout only, so there would be no way to type '€'. This design presumably is to allow for the case that multiple users of the same PC might want different languages. So before you know which user it is, you need to assume the lowest common denominator (US keyboard).
The fix up to and including Gnome 3.24 is to configure your machine to always use your preferred language/layout system-wide: Settings > Language Support > Apply System-Wide However... the design has completely changed as of 3 days ago and I no longer know how to fix it in gnome-control-center 3.25 ... https://launchpad.net/ubuntu/+source/gnome-control-center/1:3.25.92.1-0ubuntu1 ** Also affects: gnome-control-center (Ubuntu) Importance: Undecided Status: New ** Tags added: gnome-17.10 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1716159 Title: gdm greeter does not allow euro character (€) when typing password To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1716159/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs