/usr/share/doc/ is in ltsp-server 5.5.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ltsp-server/
/usr/share/doc/ltsp-server/NEWS.Debian.gz
/usr/share/doc/ltsp-server/examples/
/usr/share/doc/ltsp-server/examples/lts.conf
/usr/share/doc/ltsp-server/examples/ltsp-restart.desktop
/usr/share/doc/ltsp-server/examples/ltsp-cluster-info.desktop
/usr/share/doc/ltsp-server/examples/xinetd.d/
/usr/share/doc/ltsp-server/examples/xinetd.d/nbdswapd
/usr/share/doc/ltsp-server/examples/xinetd.d/nbdrootd
/usr/share/doc/ltsp-server/examples/dhcpd.conf
/usr/share/doc/ltsp-server/examples/ltsp-server-dnsmasq.conf
/usr/share/doc/ltsp-server/examples/ltsp-shutdown.desktop
/usr/share/doc/ltsp-server/FAQ
/usr/share/doc/ltsp-server/Upgrading_4.2
/usr/share/doc/ltsp-server/workstation
/usr/share/doc/ltsp-server/README.sound
/usr/share/doc/ltsp-server/README.Debian
/usr/share/doc/ltsp-server/README.crossarch
/usr/share/doc/ltsp-server/changelog.Debian.gz
/usr/share/doc/ltsp-server/copyright
/usr/share/doc/ltsp-server/plugins
/usr/share/doc/ltsp-server/QuickInstall
/usr/share/doc/ltsp-server/Howto.Debian