/usr/lib/libreoffice/share/extensions/ is in libreoffice-writer2xhtml 1.0.2-8ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/writer2xhtml/
/usr/lib/libreoffice/share/extensions/writer2xhtml/META-INF/
/usr/lib/libreoffice/share/extensions/writer2xhtml/META-INF/manifest.xml
/usr/lib/libreoffice/share/extensions/writer2xhtml/Options.xcs
/usr/lib/libreoffice/share/extensions/writer2xhtml/Options.xcu
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_cs_CZ.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_da_DK.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_de_DE.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_en_US.default
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_en_US.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_es_ES.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_fi_FI.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_fr_FR.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_it_IT.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_nl_NL.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_pl_PL.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_pt_BR.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_ru_RU.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_tr_TR.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/DialogStrings_uk_UA.properties
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/Module1.xba
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/XhtmlOptions.xdl
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/XhtmlOptionsCalc.xdl
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/dialog.xlb
/usr/lib/libreoffice/share/extensions/writer2xhtml/W2XDialogs/script.xlb
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_cs.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_da.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_de.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_en.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_es.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_fi
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_fr.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_it.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_nl.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_pl.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_pt_BR.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_ru.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_tr.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_uk.txt
/usr/lib/libreoffice/share/extensions/writer2xhtml/description.xml
/usr/lib/libreoffice/share/extensions/writer2xhtml/w2x_filters.xcu
/usr/lib/libreoffice/share/extensions/writer2xhtml/w2x_types.xcu
/usr/lib/libreoffice/share/extensions/writer2xhtml/writer2xhtml-filter.jar
/usr/lib/libreoffice/share/extensions/writer2xhtml/writer2xhtml.rdb