keychain software package provides key manager for OpenSSH, you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install keychain
keychain is installed in your system.
Make ensure the keychain package were installed using the commands given below,
$ sudo dpkg-query -l | grep keychain *
You will get with keychain package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | Network |
| Package | keychain |
| Version | 2.8.1-0.1 |
| Description | key manager for OpenSSH |
| Sub Section | net |