Isn't this rather a bug in your Nvidia package, which overwrites things on your system without properly using the package management system? Everything under /usr/lib is supposed to belong to a .deb package and be handled by this system.
** Changed in: xorg-server (Ubuntu)
Status: Confirmed => Rejected
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xserver-xorg-core update breaks Nvidia glx
https://launchpad.net/bugs/79071
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