$ sudo apt-get update
$ sudo apt-get install ibus-libpinyin 

ibus-libpinyin is installed in your system.

Make ensure the ibus-libpinyin package were installed using the commands given below,

$ sudo dpkg-query -l | grep ibus-libpinyin *

You will get with ibus-libpinyin package name, version, architecture and description in a table

ibus-libpinyin package basic information: