I spent at least 2.5 hours trying to hand-edit various ppd files I downloaded with strings suggested by this gist.
I consistently failed to print with Invalid accounting codes printed by the printer.
Instead, download the driver from Xerox.
sudo dpkg -i Xeroxv5Pkg-Linuxx86_64-5.20.626.4179.deb
In Ubuntu 18.04, it is ridiculously hard to run GUI applications based on X as root. Unfortunately, the xeroxprtmgr binary has a bad habit of silently exiting when it fails to connect to the X server.
You can save yourself a lot of pain by logging into Gnome as root.
These instructions can help with enabling root login through the GUI.
The shared libraries are configured in a way that needs either setting LD_LIBRARY_PATH or running the xeroxprtmgr from its own directory.
cd /opt/Xerox/prtsys
# Notice the lack of sudo, because I assume you are logged in as root.
./xeroxprtmgr
Click on the button for adding printers and select Manual. Then type in the IP Address.
Scroll all the way to the right to the Configuration tab, and then click on Accounting.
Go to the "Configuration" tab, then click on "Accounting" button. In the Accounting window, choose:
Then, enter your group account number in Default User ID input box and click OK to set the options and exit.