As a workaround, try updating your copy of the Cantarell font. From what I can tell by seeing your 14.04 screenshot, you have an old version installed, with no Cyrillic characters. In 12.04 it works because you have Calibri set as your UI font there, and Calibri does support Cyrillic.
As a workaround, try updating your copy of the Cantarell font. From what I can tell by seeing your 14.04 screenshot, you have an old version installed, with no Cyrillic characters. In 12.04 it works because you have Calibri set as your UI font there, and Calibri does support Cyrillic.