libeigen3-dev software package provides lightweight C++ template library for linear algebra, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libeigen3-dev
libeigen3-dev is installed in your system.
Make ensure the libeigen3-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libeigen3-dev *
You will get with libeigen3-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libeigen3-dev |
| Version | 3.2.0-8 |
| Description | lightweight C++ template library for linear algebra |
| Sub Section | libdevel |