I confirm this on a up-to-date ubuntu 14.04 amd64 server installation. My X server is running on a different machine.
Running gnome-terminal gives: Fontconfig warning: ignoring C.UTF-8: not a valid language tag Maybe I could change locale settings to workaround this, but it is bug and there seems to be a fix available. $ locale LANG=C.UTF-8 LANGUAGE= LC_CTYPE="C.UTF-8" LC_NUMERIC=pt_PT.UTF-8 LC_TIME=pt_PT.UTF-8 LC_COLLATE="C.UTF-8" LC_MONETARY=pt_PT.UTF-8 LC_MESSAGES="C.UTF-8" LC_PAPER=pt_PT.UTF-8 LC_NAME=pt_PT.UTF-8 LC_ADDRESS=pt_PT.UTF-8 LC_TELEPHONE=pt_PT.UTF-8 LC_MEASUREMENT=pt_PT.UTF-8 LC_IDENTIFICATION=pt_PT.UTF-8 LC_ALL= ** Changed in: fontconfig (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1164083 Title: libreoffice spams stdout with "Fontconfig warning: ignoring C.UTF-8: not a valid language tag" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1164083/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs