kuiviewer software package provides viewer for Qt Designer user interface files, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kuiviewer
kuiviewer is installed in your system.
Make ensure the kuiviewer package were installed using the commands given below,
$ sudo dpkg-query -l | grep kuiviewer *
You will get with kuiviewer package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Development |
| Package | kuiviewer |
| Version | 4:4.8.2-0ubuntu3 |
| Description | viewer for Qt Designer user interface files |
| Sub Section | devel |