KUIViewer KPart
Viewer for Qt Designer user interface files
The KUIViewer KPart allows KParts-using software to display and check user interface (.ui) files created in Qt Designer.
KUIViewer is a utility to display and check user interface (.ui) files created in Qt Designer. The interfaces can be shown in a variety of different widget styles to ensure that they display correctly in any environment. . The Qt Designer itself is in the package qttools5-dev-tools. . This package is part of the KDE Software Development Kit module.
How to install KUIViewer KPart in Ubuntu
If you are on a supported distro, you can install the application through software center by clicking the below link.
If the above link not working, run the below command in terminal to install kuiviewer in Ubuntu
sudo apt install kuiviewer