libkf5sonnet5-dbg software package provides spell checking library for Qt, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libkf5sonnet5-dbg
libkf5sonnet5-dbg is installed in your system.
Make ensure the libkf5sonnet5-dbg package were installed using the commands given below,
$ sudo dpkg-query -l | grep libkf5sonnet5-dbg *
You will get with libkf5sonnet5-dbg package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Debug packages |
| Package | libkf5sonnet5-dbg |
| Version | 5.18.0-0ubuntu1 |
| Description | spell checking library for Qt |
| Sub Section | debug |