/usr/share/zsh/functions/Completion/BSD/ is in zsh-common 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zsh/functions/Completion/BSD/_bsd_pkg
/usr/share/zsh/functions/Completion/BSD/_bsdconfig
/usr/share/zsh/functions/Completion/BSD/_bsdinstall
/usr/share/zsh/functions/Completion/BSD/_chflags
/usr/share/zsh/functions/Completion/BSD/_csup
/usr/share/zsh/functions/Completion/BSD/_cvsup
/usr/share/zsh/functions/Completion/BSD/_fetch
/usr/share/zsh/functions/Completion/BSD/_freebsd-update
/usr/share/zsh/functions/Completion/BSD/_fstat
/usr/share/zsh/functions/Completion/BSD/_jails
/usr/share/zsh/functions/Completion/BSD/_jexec
/usr/share/zsh/functions/Completion/BSD/_jls
/usr/share/zsh/functions/Completion/BSD/_kld
/usr/share/zsh/functions/Completion/BSD/_mixerctl
/usr/share/zsh/functions/Completion/BSD/_pfctl
/usr/share/zsh/functions/Completion/BSD/_portaudit
/usr/share/zsh/functions/Completion/BSD/_portlint
/usr/share/zsh/functions/Completion/BSD/_portmaster
/usr/share/zsh/functions/Completion/BSD/_portsnap
/usr/share/zsh/functions/Completion/BSD/_powerd
/usr/share/zsh/functions/Completion/BSD/_procstat
/usr/share/zsh/functions/Completion/BSD/_sockstat
/usr/share/zsh/functions/Completion/BSD/_systat
/usr/share/zsh/functions/Completion/BSD/_watch-snoop