https://bugzilla.redhat.com/show_bug.cgi?id=1527670
--- Comment #9 from ricky.tigg@gmail.com --- Issue occurred on virtual machine installed from Fedora 27 Xfce spin on QEMU/KVM. Possibly ethernet network connection "ens3" get from DHCP was not yet active when setting the language from tool ($ sudo system-config-language) whose set indeed requires connection to internet to be established unlike the activation of a language chosen in LightDM GTK. Since then the tool worked as intended.