alien software package provides convert and install rpm and other packages, 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 alien
alien is installed in your system.
Make ensure the alien package were installed using the commands given below,
$ sudo dpkg-query -l | grep alien *
You will get with alien package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Administration Utilities |
| Package | alien |
| Version | 8.9 |
| Description | convert and install rpm and other packages |
| Sub Section | Admin |