In any case I think that the claim in the bug summary and description is not correct. I just tested with a password including both € and ö and could log in using GDM just fine.
@Franck: I suspect that some other keyboard layout but the one you expect is enabled for the login screen. Can you please let us know what these two terminal commands output: cat /etc/default/keyboard gsettings get org.gnome.desktop.input-sources sources Also, to easier be able to guide you if needed, can you please let us know if you are using a one user system or if more than one user account have been created. ** Changed in: gdm3 (Ubuntu) Status: Confirmed => Invalid ** Changed in: gnome-control-center (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1716159 Title: gdm greeter does not allow non-US characters (like euro character €) when typing password Status in gdm3 package in Ubuntu: Invalid Status in gnome-control-center package in Ubuntu: Incomplete Bug description: In latest Artful (2017-09-08 daily), gdm does not allow to enter the euro character (€) when typing the password (be it with the real keyboard or with the visual on screen keyboard). Steps to reproduce: 1. on the gdm login screen, try to type € in the password field 2. the input is ignored (not big dot is added) 3. if your password contains a € symbol (which is allowed, incliding during installation with ubiquity), you cannot login anymore... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1716159/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp