I have just installed a clean Ubuntu 15.04 system and was very disappointed it highlights all the words including the ё (yo) letter as wrong and suggests replacing мёд (myod: honey) with мед (medical), etc.
This happens in both Firefox and LibreOffice and some other programs. What is the best way to fix this? I believe I could play with dictionary settings in the particular apps themselves, but I'd prefer a tidy system-wide solution if possible.