How to uninstall libavahi-qt3-dev from Ubuntu
To uninstall just libavahi-qt3-dev package itself from Ubuntu execute on terminal:
sudo apt-get remove libavahi-qt3-dev
Uninstall libavahi-qt3-dev and it's dependent packages
To uninstall the libavahi-qt3-dev package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove libavahi-qt3-dev
If you also want to delete configuration and/or data files of libavahi-qt3-dev from Ubuntu then this will work:
sudo apt-get purge libavahi-qt3-dev
To delete configuration and/or data files of libavahi-qt3-dev and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge libavahi-qt3-dev
libavahi-qt3-dev package information
Development headers for the Avahi Qt 3 integration library
Avahi is a fully LGPL framework for Multicast DNS Service Discovery. It allows programs to publish and discover services and hosts running on a local network with no specific configuration. For example you can plug into a network and instantly find printers to print to, files to look at and people to talk to. This package contains the development headers for the interface to integrate the Avahi libraries into a Qt 3 main loop application.
More information about apt-get remove
Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.
apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.
apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.