As the HPG61, problem machine, has ubuntu server OS and I used tasksel to remove lubuntu-desktop components. I thought why not reinstall centrify
so
sudo dpkg -i centrifydc-5.3.1-deb7-x86_64.deb
sudo adjoin -w i-surname.tld
sudo apt-get install ubuntu-desktop
Now I have a GUI screen but the desktop-manager is not working? So the failed installation has hangovers I need to remove. I f only I knew what they were.