fluxbox software package provides Highly configurable and low resource X11 Window manager, 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 fluxbox
fluxbox is installed in your system.
Make ensure the fluxbox package were installed using the commands given below,
$ sudo dpkg-query -l | grep fluxbox *
You will get with fluxbox package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | X Window System software |
| Package | fluxbox |
| Version | 1.3.5-2 |
| Description | Highly configurable and low resource X11 Window manager |
| Sub Section | x11 |