/usr/share/zsh/functions/Completion/Debian/ is in zsh-common 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zsh/functions/Completion/Debian/_a2utils
/usr/share/zsh/functions/Completion/Debian/_apt
/usr/share/zsh/functions/Completion/Debian/_apt-file
/usr/share/zsh/functions/Completion/Debian/_apt-move
/usr/share/zsh/functions/Completion/Debian/_apt-show-versions
/usr/share/zsh/functions/Completion/Debian/_aptitude
/usr/share/zsh/functions/Completion/Debian/_auto-apt
/usr/share/zsh/functions/Completion/Debian/_axi-cache
/usr/share/zsh/functions/Completion/Debian/_bts
/usr/share/zsh/functions/Completion/Debian/_bug
/usr/share/zsh/functions/Completion/Debian/_cdbs-edit-patch
/usr/share/zsh/functions/Completion/Debian/_dak
/usr/share/zsh/functions/Completion/Debian/_dchroot
/usr/share/zsh/functions/Completion/Debian/_dchroot-dsa
/usr/share/zsh/functions/Completion/Debian/_dcut
/usr/share/zsh/functions/Completion/Debian/_deb_architectures
/usr/share/zsh/functions/Completion/Debian/_deb_packages
/usr/share/zsh/functions/Completion/Debian/_debchange
/usr/share/zsh/functions/Completion/Debian/_debcheckout
/usr/share/zsh/functions/Completion/Debian/_debdiff
/usr/share/zsh/functions/Completion/Debian/_debfoster
/usr/share/zsh/functions/Completion/Debian/_debsign
/usr/share/zsh/functions/Completion/Debian/_dlocate
/usr/share/zsh/functions/Completion/Debian/_dpatch-edit-patch
/usr/share/zsh/functions/Completion/Debian/_dpkg
/usr/share/zsh/functions/Completion/Debian/_dpkg-buildpackage
/usr/share/zsh/functions/Completion/Debian/_dpkg-cross
/usr/share/zsh/functions/Completion/Debian/_dpkg-repack
/usr/share/zsh/functions/Completion/Debian/_dpkg_source
/usr/share/zsh/functions/Completion/Debian/_dput
/usr/share/zsh/functions/Completion/Debian/_dupload
/usr/share/zsh/functions/Completion/Debian/_git-buildpackage
/usr/share/zsh/functions/Completion/Debian/_grep-excuses
/usr/share/zsh/functions/Completion/Debian/_invoke-rc.d
/usr/share/zsh/functions/Completion/Debian/_lighttpd
/usr/share/zsh/functions/Completion/Debian/_lintian
/usr/share/zsh/functions/Completion/Debian/_madison
/usr/share/zsh/functions/Completion/Debian/_make-kpkg
/usr/share/zsh/functions/Completion/Debian/_members
/usr/share/zsh/functions/Completion/Debian/_mergechanges
/usr/share/zsh/functions/Completion/Debian/_module-assistant
/usr/share/zsh/functions/Completion/Debian/_pbuilder
/usr/share/zsh/functions/Completion/Debian/_piuparts
/usr/share/zsh/functions/Completion/Debian/_reprepro
/usr/share/zsh/functions/Completion/Debian/_schroot
/usr/share/zsh/functions/Completion/Debian/_svn-buildpackage
/usr/share/zsh/functions/Completion/Debian/_toolchain-source
/usr/share/zsh/functions/Completion/Debian/_update-alternatives
/usr/share/zsh/functions/Completion/Debian/_update-rc.d
/usr/share/zsh/functions/Completion/Debian/_uscan
/usr/share/zsh/functions/Completion/Debian/_vim-addons
/usr/share/zsh/functions/Completion/Debian/_wajig
/usr/share/zsh/functions/Completion/Debian/_wanna-build