Jay Flory, your information was the key! I removed the -116 kernel and
reinstalled it, and the graphics are fine now. It looks like this was
indeed due to a timing problem between when my system got the gcc update
and the kernel update.
It appears that I'll have to reinstall virtualbox as well.
Thanks so much for sharing your insight.
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4.4.0-116 Kernel update on 2/21 breaks Nvidia drivers (on 14.04 and
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