Hi Alan,
I just wanted to give an update that unfortuately this stopped working with.Suddenly authentication would fail, with permission denied errors, and then when restarting centrifydc-sama, it would fail with the following error: samba.adbindd2 winbindd is not running: no such file or directory
There was another problem as well, in that the script commented out some lines in /etc/pam.d/common-auth and password, that prevented ssh logins from working for domain users.
I'm afraid that I'm going to go back to using the vanilla tools, and lose out on the custom ID mapping Centrify had to offer. The toolset for Ubuntu seems to be broken.