Install kde-thumbnailer-deb by entering the following commands in the terminal:
sudo apt update sudo apt install kde-thumbnailer-deb
Description:
KDE plugin to show thumbnails of Debian package files
QApt is a collection of tools and a library providing a wrapper around APT. The intention is to ease the use of APT in Qt-based programs. . A plugin for KDE file managers (Dolphin and Konqueror) to preview Debian packages (.deb files) as thumbnails.
Homepage: https://cgit.kde.org/libqapt.git/
Version: 3.0.4-0ubuntu1
Section: universe/kde