env-preseed software package provides debconf preseeding via environment variables, you can install in your Ubuntu 16.10 (Yakkety Yak) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install env-preseed
env-preseed is installed in your system.
Make ensure the env-preseed package were installed using the commands given below,
$ sudo dpkg-query -l | grep env-preseed *
You will get with env-preseed package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | debian-installer udeb packages |
| Package | env-preseed |
| Version | 1.71ubuntu3 |
| Description | debconf preseeding via environment variables |
| Sub Section | Debian-installer |