(In reply to Fuminobu Takeyama from comment #9) > It looks ibus crashes soon after launched. > > Is there any error messages in journalctl? > After ibus disappear from the tray, please run > > $ ibus-daemon -xdv none whatsoever - and ibus runs. I think the whole mess started with one of the more recent KDE/Plasma upgrades... but I'm not sure at all.