Comment #8 on issue 1775 by takao.fujiwara1: Tamil text entry under ibus m17n not working in Lubuntu 15.04
https://code.google.com/p/ibus/issues/detail?id=1775

Anyway the problem is caused because ibus does not depends on ibus-gtk and ibus-gtk3 and it's not an upstream issue. Yes, I did a fresh installation and I guess the CD default dependency can install the sub packages but the upgrade installation would see the package dependencies.
I agree ibus-qt/qt4 is optional.

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