kdesignerplugin software package provides Integration of KF5 widgets in Qt Designer/Creator, 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 kdesignerplugin
kdesignerplugin is installed in your system.
Make ensure the kdesignerplugin package were installed using the commands given below,
$ sudo dpkg-query -l | grep kdesignerplugin *
You will get with kdesignerplugin package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | kdesignerplugin |
| Version | 5.18.0-0ubuntu1 |
| Description | Integration of KF5 widgets in Qt Designer/Creator |
| Sub Section | Libs |