How to uninstall libxmpp4r-ruby-doc from Ubuntu
To uninstall just libxmpp4r-ruby-doc package itself from Ubuntu execute on terminal:
sudo apt-get remove libxmpp4r-ruby-doc
Uninstall libxmpp4r-ruby-doc and it's dependent packages
To uninstall the libxmpp4r-ruby-doc package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove libxmpp4r-ruby-doc
If you also want to delete configuration and/or data files of libxmpp4r-ruby-doc from Ubuntu then this will work:
sudo apt-get purge libxmpp4r-ruby-doc
To delete configuration and/or data files of libxmpp4r-ruby-doc and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge libxmpp4r-ruby-doc
libxmpp4r-ruby-doc package information
Documentation for XMPP4R (libxmpp4r-ruby)
This package provides example scripts, unit tests and rdoc documentation about XMPP4R. XMPP4R is an library allowing Ruby developers to write software using XMPP or Jabber. It provides all the necessary backend to write scripts or applications acting as Jabber clients or components.
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.