It is bug in /usr/share/X11/locale/locale.dir in Ubuntu. For work in ru_RU.utf8 locale it is necessary to replace lines ru_RU.UTF-8/XLC_LOCALE ru_RU.UTF-8 with lines en_US.UTF-8/XLC_LOCALE ru_RU.UTF-8
It is bug in /usr/share/ X11/locale/ locale. dir in Ubuntu. 8/XLC_LOCALE ru_RU.UTF-8 8/XLC_LOCALE ru_RU.UTF-8
For work in ru_RU.utf8 locale it is necessary to replace lines
ru_RU.UTF-
with lines
en_US.UTF-