kde-style-breeze-qt4 software package provides Widget style for Qt 4 and KDE Software, 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 kde-style-breeze-qt4
kde-style-breeze-qt4 is installed in your system.
Make ensure the kde-style-breeze-qt4 package were installed using the commands given below,
$ sudo dpkg-query -l | grep kde-style-breeze-qt4 *
You will get with kde-style-breeze-qt4 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | KDE |
| Package | kde-style-breeze-qt4 |
| Version | 4:5.5.5-0ubuntu1 |
| Description | Widget style for Qt 4 and KDE Software |
| Sub Section | KDE |