No Urbackupclientgui on Ubuntu 18.04

Hello, i would like to have a clientgui for Ubuntu 18.04 (urbackup linux server 2.3.8)

I have used this installation: https://www.urbackup.org/client_debian_ubuntu_install.html
I can backup, but i have not clientgui.

If i use
:# urbackupclientgui
[]
Nothing is happen :frowning:

Didnt see any in debug.log.
What could i do?