Question: Today I was cloning a couple of images of Ubuntu to further expand the use of Ubuntu over the company but just noticed that all cloned PCs have the same Teamviewer ID. I followed teamviewer forum suggestion about purging teamviewer, removing the .config/teamviewer9 folder and even the /opt/teamviewer one with no luck. The ID stays the same even after rebooting or waiting for about 30 mins before installing teamviewer again.

How can I reset/change the Teamviewer ID in Ubuntu for all the cloned computers. Right now I am using the latest version of Teamviewer (Version 9).

Answer: 
Try to change the **MAC Addresses** for Cloned PCs

TeamViewer ID depends on it for sure.
None of the previous suggestions worked in my case.
The quickest and most effective solution I found was to re-install TeamViewer fresh (after uninstall and deletion of config files in Library/Preferences) from an alternative new user account, that solved it immediately.