/usr/ is in libcharon-standard-plugins 5.6.2-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ipsec/
/usr/lib/ipsec/plugins/
/usr/lib/ipsec/plugins/libstrongswan-eap-mschapv2.so
/usr/lib/ipsec/plugins/libstrongswan-xauth-generic.so
/usr/share/
/usr/share/doc/
/usr/share/doc/libcharon-standard-plugins/
/usr/share/doc/libcharon-standard-plugins/copyright
/usr/share/strongswan/
/usr/share/strongswan/templates/
/usr/share/strongswan/templates/config/
/usr/share/strongswan/templates/config/plugins/
/usr/share/strongswan/templates/config/plugins/eap-mschapv2.conf
/usr/share/strongswan/templates/config/plugins/xauth-generic.conf
/usr/share/doc/libcharon-standard-plugins/NEWS.Debian.gz
/usr/share/doc/libcharon-standard-plugins/changelog.Debian.gz