How to fully uninstall or purge the Ubuntu/Debian GUI client installed from sources?

Hi there,
I have installed the Debian/Ubuntu client with GUI from sources according to UrBackup - Install client on Debian or Ubuntu from sources .
Now I want to fully purge it. I read in this forum several times that the script “uninstall_urbackupclient” located in /usr/local/sbin should do the magic. However, I miss this script in /usr/local/sbin . Moreover, I can not find it anywhere on my computer at all. I have no clue at the moment on how to proceed with purging the GUI client. Could someone provide me a hint please?
Thanks in advance.