/usr/ is in gcj-jdk 4:4.6.3-1ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pkgconfig/x86_64-linux-gnu/
/usr/bin/gappletviewer
/usr/bin/gtnameserv
/usr/bin/gcj-wrapper
/usr/bin/jcf-dump
/usr/bin/jv-convert
/usr/bin/grmic
/usr/bin/gjarsigner
/usr/bin/gjar
/usr/bin/gcjh
/usr/bin/x86_64-linux-gnu-gcj
/usr/bin/gcj
/usr/bin/gjavah
/usr/bin/gjdoc
/usr/bin/
/usr/bin/dh_javadoc
/usr/share/
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/dh_javadoc.1.gz
/usr/share/doc/
/usr/share/java/
/usr/share/info/
/usr/lib/
/usr/lib/pkgconfig/
/usr/share/man/man1/gappletviewer.1.gz
/usr/share/man/man1/gtnameserv.1.gz
/usr/share/man/man1/gnative2ascii.1.gz
/usr/share/man/man1/gjavah.1.gz
/usr/share/man/man1/gjarsigner.1.gz
/usr/share/man/man1/gjar.1.gz
/usr/share/man/man1/gcj-wrapper.1.gz
/usr/share/man/man1/jcf-dump.1.gz
/usr/share/man/man1/jv-convert.1.gz
/usr/share/man/man1/grmic.1.gz
/usr/share/man/man1/gcjh.1.gz
/usr/share/man/man1/x86_64-linux-gnu-gcj.1.gz
/usr/share/man/man1/gcj.1.gz
/usr/share/man/man1/gjdoc.1.gz
/usr/share/doc/gcj-jdk
/usr/share/java/libgcj.jar
/usr/share/info/gcj.info.gz
/usr/lib/pkgconfig/x86_64-linux-gnu/libgcj.pc