libecryptfs-dev software package provides ecryptfs cryptographic filesystem (development), 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 libecryptfs-dev
libecryptfs-dev is installed in your system.
Make ensure the libecryptfs-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libecryptfs-dev *
You will get with libecryptfs-dev package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Library development |
| Package | libecryptfs-dev |
| Version | 111-0ubuntu1.1 [amd64, i386], |
| Description | ecryptfs cryptographic filesystem (development) |
| Sub Section | Devel |