Replacing iBus with Fcitx would be a good solution for this issue. After my test, Fcitx English, Chinese input methods do work in Chromium 34 Ubuntu 14.04 aura (260972), and of course in Lubuntu 14.04.
I just upgraded to Lubuntu 14.04 from 13.10 successfully, via
But When I opened Chromium, I found that I can not input any word, or use any shortcut in Chromium, not only in the textbox ... but also in address bar.
Keyboard does not work totally right now in Chromium Version 34.0.1847.116 Ubuntu 14.04 aura (260972).
However, keyboard works perfectly in firebox (I ask question from it), in bash, etc.
Does anyone face the same issue, and if you have solution, please tell me.