$ sudo apt-get update
$ sudo apt-get install fcitx-googlepinyin 

fcitx-googlepinyin is installed in your system.

Make ensure the fcitx-googlepinyin package were installed using the commands given below,

$ sudo dpkg-query -l | grep fcitx-googlepinyin *

You will get with fcitx-googlepinyin package name, version, architecture and description in a table

fcitx-googlepinyin package basic information: