I found some sbin commands whose man pages perhaps should be in
section 8, not 1.

powermgmt-base: /usr/share/man/man1/acpi_available.1.gz
powermgmt-base: /usr/share/man/man1/apm_available.1.gz
dlocate: /usr/share/man/man1/dpkg-hold.1.gz
dlocate: /usr/share/man/man1/dpkg-purge.1.gz
dlocate: /usr/share/man/man1/dpkg-remove.1.gz
dlocate: /usr/share/man/man1/dpkg-unhold.1.gz
libgraphviz4: /usr/share/man/man1/libgraphviz4-config-update.1.gz
piuparts: /usr/share/man/man1/piuparts.1.gz
wodim: /usr/share/man/man1/netscsid.1.gz
powermgmt-base: /usr/share/man/man1/on_ac_power.1.gz
util-linux: /usr/share/man/man1/readprofile.1.gz
libpango1.0-common: /usr/share/man/man1/update-pangox-aliases.1.gz
xjdic: /usr/share/man/man1/xjdicconfig.1.gz