astrometry-data-tycho2 software package provides Astrometry.net Tycho-2 index files, 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 astrometry-data-tycho2
astrometry-data-tycho2 is installed in your system.
Make ensure the astrometry-data-tycho2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep astrometry-data-tycho2 *
You will get with astrometry-data-tycho2 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Science |
| Package | astrometry-data-tycho2 |
| Version | 02-03-16 |
| Description | Astrometry.net Tycho-2 index files |
| Sub Section | Science |