/usr/ is in libroot-montecarlo-eg-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/share/
/usr/share/doc/
/usr/share/doc/libroot-montecarlo-eg-dev/
/usr/share/doc/libroot-montecarlo-eg-dev/copyright
/usr/include/
/usr/include/root/
/usr/include/root/TAttParticle.h
/usr/include/root/Hepevt.h
/usr/include/root/TDatabasePDG.h
/usr/include/root/TPrimary.h
/usr/include/root/TParticlePDG.h
/usr/include/root/TGenerator.h
/usr/include/root/TParticleClassPDG.h
/usr/include/root/TParticle.h
/usr/include/root/TDecayChannel.h
/usr/include/root/TVirtualMCDecayer.h
/usr/lib/x86_64-linux-gnu/libEG.so
/usr/share/doc/libroot-montecarlo-eg-dev/changelog.Debian.gz
/usr/include/root/cfortran.h