apt software package provides commandline package 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 apt
apt is installed in your system.
Make ensure the apt package were installed using the commands given below,
$ sudo dpkg-query -l | grep apt *
You will get with apt package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Administration Utilities |
| Package | apt |
| Version | 1.0.1ubuntu2.13 [amd64, i386], |
| Description | commandline package manager |
| Sub Section | Admin |