Install ibus-gtk3 by entering the following commands in the terminal:
sudo apt update sudo apt install ibus-gtk3
Description:
Intelligent Input Bus - GTK+3 support
IBus is an Intelligent Input Bus. It is a new input framework for the Linux OS. It provides full featured and user friendly input method user interface. It also may help developers to develop input method easily. . This package contains the GTK+3 IM module.
Homepage: https://github.com/ibus/ibus/releases
Version: 1.5.17-3ubuntu4
Section: utils