I'm trying to upgrade an old Dell Inspiron 660s with a Zotac GT1030 graphics card. It comes with a built-in Intel graphics chip, but I would want to use the GT1030 solely.
However, when I try to install Ubuntu 18.04, the installer almost immediately fails with the error "DRM: nouveau failed to create kernel channel -22".
That sounds similar to this question. That poster mentioned that the problem was a bug in Ubuntu triggered by the dual graphics cards, and they were able to fix the problem by disabling the onboard graphics chip in their bios. However, checking the 660s bios shows no options to disable onboard graphics.
How do I fix this?