That menu is supposed to show translations for installed languages. It looks to me as if you have removed English, and if so, only Russian remains to be shown. Please confirm.
** Changed in: lightdm-gtk-greeter (Ubuntu) Status: New => Incomplete ** No longer affects: lightdm (Ubuntu) -- You received this bug notification because you are a member of LightDM Gtk+ Greeter Development Team, which is subscribed to lightdm-gtk- greeter in Ubuntu. https://bugs.launchpad.net/bugs/1665627 Title: No language selection possible Status in lightdm-gtk-greeter package in Ubuntu: Incomplete Bug description: PROBLEM: on the GTK greeter login screen, the language selection menu contain only a "Russian" entry, which seems to be a fallback value. Based on a system configuration, at least 3 options must have been present. VERSION: lightdm 1.21.4-0ubuntu1 lightdm-gtk-greeter 2.1.0-2ubuntu4 UBUNTU: Zesty Zapus (17.04) locale -a: C C.UTF-8 en_US.utf8 POSIX ru_RU.utf8 ru_UA.utf8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1665627/+subscriptions -- Mailing list: https://launchpad.net/~lightdm-gtk-greeter-team Post to : lightdm-gtk-greeter-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~lightdm-gtk-greeter-team More help : https://help.launchpad.net/ListHelp