NVIDIA driver 450 is not loaded, trying to use dual TITAN RTXs

I have a desktop running Ubuntu 18.04.5 LTS (with Win10 dual boot)
uname -r = 5.4.0-48-generic
I have two TITAN RTX GPUs for Tensorflow
and the motherboard Intel GPU, which I use for display, confirmed by prime-select query = intel

A year ago I followed an AI/ML article and installed the NVIDA drivers using PPA. All worked well, until it didn’t. I think it may be related to apt-get dist-upgrade , but not sure.
I have tried many solutions from this thread, but no luck.

Current status:
lshw -C display shows both TITANs as UNCLAIMED
secure boot is not enabled
apt install nvidia-driver-450 = nvidia-driver-450 is already the newest version (450.51.06-0ubuntu1)
nvidia-settings = ERROR: NVIDIA driver is not loaded

Note: Originally responded in an old (un-monitored?) post - NVIDIA driver is not loaded. Ubuntu 18.10

Any advice would be greatly appreciated…

nvidia-bug-report.log.gz (138.7 KB)