Can't change number and date format

[oktay_y2003]

Hi, when I try to change numbers and date format in Setting->Region & Language->Format, the window quits suddenly without any change taking effect, but when I change the main language of the system, format changes automatically without any problem.

[Aragorn]

[root tip] [How To] Troubleshooting locale errors

Difficulty: ★☆☆☆☆ Locale Errors Locale errors are not always obvious and some applications simply stop working without any hints at all - e.g. Gnome Terminal is very sensitive to incorrect configuration of locale. TL:DR As root edit the file /etc/locale.gen Enable the needed locales - including en_US.UTF-8 UTF-8 as fallback. Rebuild the locale database using the locale-gen script Calamares installer The Calamares installer adds the locales chosen to the end of /etc/locale.gen so check the …

[oktay_y2003]

1. As root edit the file /etc/locale.gen
2. Enable the needed locales - including en_US.UTF-8 UTF-8 as fallback.
3. Rebuild the locale database using the locale-gen script

Thank you!. It solved the problem.