Hi PeteX, thanks for the info. I downloaded your 12.04 x86_64 .deb and noticed this:
dpkg -I panda3d1.8_1.8.0_amd64.deb
…
Depends:
…
nvidia-current
…
This is the nvidia binary driver and I’m guessing you added it by mistake. I missed it during install and ended up without graphics drivers for a brief period. If you are still able to edit your post to reflect this or rebuild the deb without this dependency I think that would be helpful.