apt-offline software package provides offline apt 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-offline
apt-offline is installed in your system.
Make ensure the apt-offline package were installed using the commands given below,
$ sudo dpkg-query -l | grep apt-offline *
You will get with apt-offline package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Administration Utilities |
| Package | apt-offline |
| Version | 1.1.1build1 |
| Description | offline apt package manager |
| Sub Section | Admin |