/usr/share/kf5/kdoctools/customization/en/ is in kdoctools5 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kf5/kdoctools/customization/en-GB/catalog.xml
/usr/share/kf5/kdoctools/customization/en-GB/entities/
/usr/share/kf5/kdoctools/customization/en-GB/entities/fdl-notice.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/gpl-notice.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/help-menu.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/install-compile.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/install-intro.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/lgpl-notice.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/report-bugs.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/underArtisticLicense.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/underBSDLicense.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/underFDL.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/underGPL.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/underX11License.docbook
/usr/share/kf5/kdoctools/customization/en-GB/entities/update-doc.docbook
/usr/share/kf5/kdoctools/customization/en-GB/lang.entities
/usr/share/kf5/kdoctools/customization/en-GB/strings.entities
/usr/share/kf5/kdoctools/customization/en-GB/user.entities
/usr/share/kf5/kdoctools/customization/en/catalog.xml
/usr/share/kf5/kdoctools/customization/en/entities/
/usr/share/kf5/kdoctools/customization/en/entities/fdl-notice.docbook
/usr/share/kf5/kdoctools/customization/en/entities/gpl-notice.docbook
/usr/share/kf5/kdoctools/customization/en/entities/help-menu.docbook
/usr/share/kf5/kdoctools/customization/en/entities/install-compile.docbook
/usr/share/kf5/kdoctools/customization/en/entities/install-intro.docbook
/usr/share/kf5/kdoctools/customization/en/entities/lgpl-notice.docbook
/usr/share/kf5/kdoctools/customization/en/entities/report-bugs.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underArtisticLicense.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underBSDLicense.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underFDL.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underGPL.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underLGPL.docbook
/usr/share/kf5/kdoctools/customization/en/entities/underX11License.docbook
/usr/share/kf5/kdoctools/customization/en/entities/update-doc.docbook
/usr/share/kf5/kdoctools/customization/en/lang.entities
/usr/share/kf5/kdoctools/customization/en/strings.entities
/usr/share/kf5/kdoctools/customization/en/user.entities
/usr/share/kf5/kdoctools/customization/entities/contributor.entities
/usr/share/kf5/kdoctools/customization/entities/general.entities
/usr/share/kf5/kdoctools/customization/entities/l10n.entities