Sysadmin module installation error ubuntu

Hello Freepbx experts,

I need a little help regarding installation of sysadmin module in freepbx. I have installed all the required dependencies, but when i try to install it, its giving me error:

"Please wait while module actions are performed

package sysadmin is not installed Unable to determine sysadmin rpm version…exiting
Error(s) installing sysadmin:
Failed to run installation scripts"

When i try to install from CLI console of my Ubuntu server, i get following error:

xxxx-server:/usr/src# yum install sysadmin
Error: Cannot retrieve repository metadata (repomd.xml) for repository: schmooze-commercial. Please verify its path and try again

I would really appreciate any help in this regard. Thanks

Sysadmin is for CentOS only