ibus-sunpinyin software package provides sunpinyin engine for ibus, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ibus-sunpinyin
ibus-sunpinyin is installed in your system.
Make ensure the ibus-sunpinyin package were installed using the commands given below,
$ sudo dpkg-query -l | grep ibus-sunpinyin *
You will get with ibus-sunpinyin package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | ibus-sunpinyin |
| Version | 2.0.3-5+b2 [amd64, armel, armh |
| Description | sunpinyin engine for ibus |
| Sub Section | Utils |