lxde-core software package provides Meta-package for the Lightweight X11 Desktop Environment Core, 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 lxde-core
lxde-core is installed in your system.
Make ensure the lxde-core package were installed using the commands given below,
$ sudo dpkg-query -l | grep lxde-core *
You will get with lxde-core package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | X Window System software |
| Package | lxde-core |
| Version | 0.5.0-4ubuntu4 |
| Description | Meta-package for the Lightweight X11 Desktop Environment Core |
| Sub Section | x11 |