/usr/share/ettercap/lua/ is in ettercap-common 1:0.8.1-3+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ettercap/lua/core/
/usr/share/ettercap/lua/core/base64.lua
/usr/share/ettercap/lua/core/dumper.lua
/usr/share/ettercap/lua/core/ec_string.lua
/usr/share/ettercap/lua/core/eclib.lua
/usr/share/ettercap/lua/core/ettercap.lua
/usr/share/ettercap/lua/core/ettercap_ffi.lua
/usr/share/ettercap/lua/core/ettercap_reg.lua
/usr/share/ettercap/lua/core/hook_points.lua
/usr/share/ettercap/lua/core/http.lua
/usr/share/ettercap/lua/core/packet.lua
/usr/share/ettercap/lua/core/packet_meta.lua
/usr/share/ettercap/lua/core/shortpacket.lua
/usr/share/ettercap/lua/core/shortsession.lua
/usr/share/ettercap/lua/init.lua
/usr/share/ettercap/lua/scripts/
/usr/share/ettercap/lua/scripts/get_imap_demo.lua
/usr/share/ettercap/lua/scripts/http_creds.lua
/usr/share/ettercap/lua/scripts/http_requests.lua
/usr/share/ettercap/lua/scripts/inject_http.lua
/usr/share/ettercap/lua/scripts/inject_http_demo.lua
/usr/share/ettercap/lua/scripts/smtp_redir.lua
/usr/share/ettercap/lua/scripts/tcp_session_demo.lua
/usr/share/ettercap/lua/third-party/
/usr/share/ettercap/lua/third-party/base.lua
/usr/share/ettercap/lua/third-party/bin.lua
/usr/share/ettercap/lua/third-party/debug_ext.lua
/usr/share/ettercap/lua/third-party/debug_init.lua
/usr/share/ettercap/lua/third-party/fstable.lua
/usr/share/ettercap/lua/third-party/getopt.lua
/usr/share/ettercap/lua/third-party/io_ext.lua
/usr/share/ettercap/lua/third-party/lcs.lua
/usr/share/ettercap/lua/third-party/list.lua
/usr/share/ettercap/lua/third-party/math_ext.lua
/usr/share/ettercap/lua/third-party/mbox.lua
/usr/share/ettercap/lua/third-party/modules.lua
/usr/share/ettercap/lua/third-party/object.lua
/usr/share/ettercap/lua/third-party/package_ext.lua
/usr/share/ettercap/lua/third-party/parser.lua
/usr/share/ettercap/lua/third-party/set.lua
/usr/share/ettercap/lua/third-party/std.lua
/usr/share/ettercap/lua/third-party/strbuf.lua
/usr/share/ettercap/lua/third-party/strict.lua
/usr/share/ettercap/lua/third-party/string_ext.lua
/usr/share/ettercap/lua/third-party/table_ext.lua
/usr/share/ettercap/lua/third-party/tree.lua
/usr/share/ettercap/lua/third-party/xml.lua