Chinese PinYin Input Method in Ubuntu 16.04
http://ubuntuhandbook.org/index.php/2016/07/2-best-chinese-pinyin-im-ubuntu-16-04/
1. Fcitx is available in Ubuntu universe repository, so you can easily install it by opening terminal (Ctrl+Alt+T) and run:
sudo apt install fcitx fcitx-googlepinyin fcitx-table-wbpy fcitx-pinyin fcitx-sunpinyin