Hi @laserbeam,
Did you patch the Y2K22 bug? https://support.xilinx.com/s/article/76960?language=en_US
I helped someone else before to get PYNQ running on the official Ubuntu image for ZCU102, you can check it here An Attempt to Install PYNQ on Ubuntu for ZCU102, this can be more effective for you instead of building the PYNQ image.
Mario