How to uninstall libboost-mpi1.42.0 from Ubuntu
To uninstall just libboost-mpi1.42.0 package itself from Ubuntu execute on terminal:
sudo apt-get remove libboost-mpi1.42.0
Uninstall libboost-mpi1.42.0 and it's dependent packages
To uninstall the libboost-mpi1.42.0 package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove libboost-mpi1.42.0
If you also want to delete configuration and/or data files of libboost-mpi1.42.0 from Ubuntu then this will work:
sudo apt-get purge libboost-mpi1.42.0
To delete configuration and/or data files of libboost-mpi1.42.0 and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge libboost-mpi1.42.0
libboost-mpi1.42.0 package information
C++ interface to the Message Passing Interface (MPI)
This package forms part of the Boost C++ Libraries collection. The Boost.MPI library provides a C++ interface to MPI that supports modern C++ development styles, including complete support for user-defined data types and C++ Standard Library types, arbitrary function objects for collective algorithms, and the use of modern C++ library techniques to maintain maximal efficiency.
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.