/usr/ is in libgl1-mesa-glx-lts-quantal 9.0.3-0ubuntu0.1~precise3.
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/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/mesa/
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1.2.0
/usr/lib/x86_64-linux-gnu/mesa/ld.so.conf
/usr/lib/x86_64-linux-gnu/xorg/
/usr/lib/x86_64-linux-gnu/xorg/x11-extra-modules/
/usr/share/
/usr/share/doc/
/usr/share/doc/libgl1-mesa-glx-lts-quantal/
/usr/share/doc/libgl1-mesa-glx-lts-quantal/copyright
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/libgl1-mesa-glx-lts-quantal
/usr/share/bug/
/usr/share/bug/libgl1-mesa-glx-lts-quantal/
/usr/share/bug/libgl1-mesa-glx-lts-quantal/script
/usr/share/bug/libgl1-mesa-glx-lts-quantal/control
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
/usr/share/doc/libgl1-mesa-glx-lts-quantal/changelog.Debian.gz