libgranite2 software package provides extension of GTK+ libraries, 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 libgranite2
libgranite2 is installed in your system.
Make ensure the libgranite2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgranite2 *
You will get with libgranite2 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | libgranite2 |
| Version | 0.3.0-2~experimental1ubuntu2 |
| Description | extension of GTK+ libraries |
| Sub Section | Libs |