Hi, for some time past I get error: unknown encoding UTF8: using iso88591 as fallback when running GTK2 and GTK3 apps, Pluma, Claws Mail, Evolution. Other apps, perhaps Qt apps, might be affected too. There are no issues when using those apps, the terminal just shows these messages. [rocketmouse@archlinux ~]$ locale -a C de_DE de_DE@euro de_DE.iso88591 de_DE.iso885915@euro de_DE.utf8 deutsch en_GB en_GB.iso88591 en_GB.utf8 en_US en_US.iso88591 en_US.utf8 german POSIX [rocketmouse@archlinux ~]$ cat /etc/locale.conf LANG=en_US.UTF-8 [rocketmouse@archlinux ~]$ cat ~/.config/locale.conf cat: /home/rocketmouse/.config/locale.conf: No such file or directory [rocketmouse@archlinux ~]$ sudo nano /etc/locale.conf [rocketmouse@archlinux ~]$ cat /etc/locale.conf LANG=en_US.utf8 [rocketmouse@archlinux ~]$ sudo shutdown -r now It doesn't make a difference, I still get the error messages, when running a new session. Regards, Ralf