This IS a bug, not an "Invalid country language combinations". This issue is only happening when using american english as default ("preferred") language. Using british english language while leaving country to what you want (France in my case) fix the issue
KDE locale gui settings are as follow : - country define regional settings (time format, numeric, monetary symbol,, etc) - languages define ... language -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1322968 Title: Changing country leads to invalid locale To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-runtime/+bug/1322968/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs