/usr/lib/swi-prolog/library/dialect/ciao/ is in swi-prolog-nox 5.10.4-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/swi-prolog/library/dialect/ciao/aggregates.pl
/usr/lib/swi-prolog/library/dialect/ciao/assertions.pl
/usr/lib/swi-prolog/library/dialect/ciao/classic.pl
/usr/lib/swi-prolog/library/dialect/ciao/engine/
/usr/lib/swi-prolog/library/dialect/ciao/engine/hiord_rt.pl
/usr/lib/swi-prolog/library/dialect/ciao/engine/internals.pl
/usr/lib/swi-prolog/library/dialect/ciao/format.pl
/usr/lib/swi-prolog/library/dialect/ciao/iso_misc.pl
/usr/lib/swi-prolog/library/dialect/ciao/isomodes.pl
/usr/lib/swi-prolog/library/dialect/ciao/lists.pl
/usr/lib/swi-prolog/library/dialect/ciao/read.pl
/usr/lib/swi-prolog/library/dialect/ciao/regtypes.pl
/usr/lib/swi-prolog/library/dialect/ciao/sockets.pl
/usr/lib/swi-prolog/library/dialect/ciao/strings.pl
/usr/lib/swi-prolog/library/dialect/ciao/system.pl
/usr/lib/swi-prolog/library/dialect/ciao/terms.pl
/usr/lib/swi-prolog/library/dialect/ciao/write.pl