In answers with tag "keyboard-layout" I don't found my case so have to ask. I'm using three languages: English-US (as base), Russian and Ukrainian installed. Ubuntu 14.04 Trusty (desktop:Unity) allow me switch English-Russian (Win+space) and only this two are present in language-icon menu.
"Text entry settings" doesn't appears at all.
In dconf setting source in [('xkb', 'us'), ('xkb', 'ru'), ('xkb', 'ua')] revert to [('xkb', 'us'), ('xkb', 'ru')].
In "System Settings >> Language Support >> Default input method" settled "none" and not changeable.
My demand is English first so I want see English menu etc., but I'm fluent in with Russian and Ukrainian and develop soft for this languages.
In Window I'm easy use this three and how can I do it with Ubuntu?