fdflush software package provides Flush out-of-date disk buffers, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,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 fdflush
fdflush is installed in your system.
Make ensure the fdflush package were installed using the commands given below,
$ sudo dpkg-query -l | grep fdflush *
You will get with fdflush package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Utilities |
| Package | fdflush |
| Version | 1.0.1.3 |
| Description | Flush out-of-date disk buffers |
| Sub Section | Utils |