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/usr/share/doc/ is in g++-8 8-20180414-1ubuntu2.

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File Mime Type Owner Mode Size
..
/usr/share/doc/gcc-8-base/ root:root 0o755
/usr/share/doc/gcc-8-base/C++/ root:root 0o755
/usr/share/doc/gcc-8-base/C++/README.C++ text/plain root:root 0o644 1.2 KB
/usr/share/doc/gcc-8-base/C++/changelog.gz application/gzip root:root 0o644 19.0 KB
/usr/share/doc/g++-8 root:root 0o777