fonts-powerline software package provides powerline symbols font, 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 fonts-powerline
fonts-powerline is installed in your system.
Make ensure the fonts-powerline package were installed using the commands given below,
$ sudo dpkg-query -l | grep fonts-powerline *
You will get with fonts-powerline package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Python |
| Package | fonts-powerline |
| Version | 2.3-1 |
| Description | powerline symbols font |
| Sub Section | Python |