/usr/share/netplan/ is in netplan.io 0.40.1~18.04.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/netplan/netplan/
/usr/share/netplan/netplan.script
/usr/share/netplan/netplan/__init__.py
/usr/share/netplan/netplan/cli/
/usr/share/netplan/netplan/cli/__init__.py
/usr/share/netplan/netplan/cli/commands/
/usr/share/netplan/netplan/cli/commands/__init__.py
/usr/share/netplan/netplan/cli/commands/apply.py
/usr/share/netplan/netplan/cli/commands/generate.py
/usr/share/netplan/netplan/cli/commands/ip.py
/usr/share/netplan/netplan/cli/commands/migrate.py
/usr/share/netplan/netplan/cli/commands/try_command.py
/usr/share/netplan/netplan/cli/core.py
/usr/share/netplan/netplan/cli/utils.py
/usr/share/netplan/netplan/configmanager.py
/usr/share/netplan/netplan/terminal.py