apt software package provides commandline package manager, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) 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 12 04 lts precise pangolin |
| Section | Administration Utilities |
| Package | apt |
| Version | 0.8.16~exp12ubuntu10.21 [amd64 |
| Description | commandline package manager |
| Sub Section | Admin |