attr software package provides Utilities for manipulating filesystem extended attributes, 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 attr
attr is installed in your system.
Make ensure the attr package were installed using the commands given below,
$ sudo dpkg-query -l | grep attr *
You will get with attr package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Utilities |
| Package | attr |
| Version | 1:2.4.47-2 |
| Description | Utilities for manipulating filesystem extended attributes |
| Sub Section | Utils |