/usr/share/gap/pkg/Alnuth/htm/ is in gap-alnuth 3.1.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gap/pkg/Alnuth/htm/CHAP001.htm
/usr/share/gap/pkg/Alnuth/htm/CHAP002.htm
/usr/share/gap/pkg/Alnuth/htm/CHAP003.htm
/usr/share/gap/pkg/Alnuth/htm/CHAP004.htm
/usr/share/gap/pkg/Alnuth/htm/biblio.htm
/usr/share/gap/pkg/Alnuth/htm/chapters.htm
/usr/share/gap/pkg/Alnuth/htm/indxA.htm
/usr/share/gap/pkg/Alnuth/htm/indxC.htm
/usr/share/gap/pkg/Alnuth/htm/indxD.htm
/usr/share/gap/pkg/Alnuth/htm/indxE.htm
/usr/share/gap/pkg/Alnuth/htm/indxF.htm
/usr/share/gap/pkg/Alnuth/htm/indxG.htm
/usr/share/gap/pkg/Alnuth/htm/indxI.htm
/usr/share/gap/pkg/Alnuth/htm/indxL.htm
/usr/share/gap/pkg/Alnuth/htm/indxM.htm
/usr/share/gap/pkg/Alnuth/htm/indxN.htm
/usr/share/gap/pkg/Alnuth/htm/indxP.htm
/usr/share/gap/pkg/Alnuth/htm/indxR.htm
/usr/share/gap/pkg/Alnuth/htm/indxS.htm
/usr/share/gap/pkg/Alnuth/htm/indxU.htm
/usr/share/gap/pkg/Alnuth/htm/theindex.htm