elpa-helm-core software package provides Emacs Helm library files, 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 elpa-helm-core
elpa-helm-core is installed in your system.
Make ensure the elpa-helm-core package were installed using the commands given below,
$ sudo dpkg-query -l | grep elpa-helm-core *
You will get with elpa-helm-core package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | Lisp |
| Package | elpa-helm-core |
| Version | 2.2.0-1 |
| Description | Emacs Helm library files |
| Sub Section | lisp |