apt-mirror software package provides APT sources mirroring tool, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install apt-mirror
apt-mirror is installed in your system.
Make ensure the apt-mirror package were installed using the commands given below,
$ sudo dpkg-query -l | grep apt-mirror *
You will get with apt-mirror package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | apt-mirror |
| Version | 0.5.1-1ubuntu1 |
| Description | APT sources mirroring tool |
| Sub Section | Net |