Ubuntu uses the locales provided by glibc, not CLDR. The Russian locales currently available in glibc are:
$ cat /usr/share/i18n/SUPPORTED | grep ^ru ru_RU.UTF-8 UTF-8 ru_RU.KOI8-R KOI8-R ru_RU ISO-8859-5 ru_RU.CP1251 CP1251 ru_UA.UTF-8 UTF-8 ru_UA KOI8-U The man page you mentioned is for a Perl module. ** Changed in: glibc (Ubuntu) Status: New => Invalid ** Tags removed: trusty xenial yakkety -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1658475 Title: Error: 'ru_KZ.utf8' is not a supported language or locale To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1658475/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs