fb-modules-4.4.0-21-generic-di software package provides Framebuffer modules, 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 fb-modules-4.4.0-21-generic-di
fb-modules-4.4.0-21-generic-di is installed in your system.
Make ensure the fb-modules-4.4.0-21-generic-di package were installed using the commands given below,
$ sudo dpkg-query -l | grep fb-modules-4.4.0-21-generic-di*
You will get with fb-modules-4.4.0-21-generic-di package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | debian-installer udeb packages |
| Package | fb-modules-4.4.0-21-generic-di |
| Version | 4.4.0-21.37 |
| Description | Framebuffer modules |
| Sub Section | Debian-installer |