clearlooks-phenix-theme software package provides GTK3 port of Clearlooks theme, 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 clearlooks-phenix-theme
clearlooks-phenix-theme is installed in your system.
Make ensure the clearlooks-phenix-theme package were installed using the commands given below,
$ sudo dpkg-query -l | grep clearlooks-phenix-theme *
You will get with clearlooks-phenix-theme package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | GNOME |
| Package | clearlooks-phenix-theme |
| Version | 7.0-1 |
| Description | GTK3 port of Clearlooks theme |
| Sub Section | GNOME |