Comment 69 for bug 359392

usr/lib/dri/i965_dri.so is provided by the package libgl1-mesa-dri.

So indeed these errors suggest you are now missing that package, or you have a permissions problem with it, so I agree you have some installation problem with Bryce's package.

Meanwhile this means your system is not even trying to use DRI, so clearly you aren't going to trigger any bugs. :-) But I also imagine this means you've had a slowdown?