libunity-2d-private-dev software package provides transitional dummy package, 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 libunity-2d-private-dev
libunity-2d-private-dev is installed in your system.
Make ensure the libunity-2d-private-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libunity-2d-private-dev *
You will get with libunity-2d-private-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libunity-2d-private-dev |
| Version | 7.2.2+14.04.20140714-0ubuntu1. |
| Description | transitional dummy package |
| Sub Section | libdevel |