/usr/share/lua/ is in lua-socket 3.0~rc1+git+ac3201d-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/lua/5.1/
/usr/share/lua/5.1/ltn12.lua
/usr/share/lua/5.1/mime.lua
/usr/share/lua/5.1/socket/
/usr/share/lua/5.1/socket.lua
/usr/share/lua/5.1/socket/ftp.lua
/usr/share/lua/5.1/socket/headers.lua
/usr/share/lua/5.1/socket/http.lua
/usr/share/lua/5.1/socket/mbox.lua
/usr/share/lua/5.1/socket/smtp.lua
/usr/share/lua/5.1/socket/tp.lua
/usr/share/lua/5.1/socket/url.lua
/usr/share/lua/5.2/
/usr/share/lua/5.2/ltn12.lua
/usr/share/lua/5.2/mime.lua
/usr/share/lua/5.2/socket/
/usr/share/lua/5.2/socket.lua
/usr/share/lua/5.2/socket/ftp.lua
/usr/share/lua/5.2/socket/headers.lua
/usr/share/lua/5.2/socket/http.lua
/usr/share/lua/5.2/socket/mbox.lua
/usr/share/lua/5.2/socket/smtp.lua
/usr/share/lua/5.2/socket/tp.lua
/usr/share/lua/5.2/socket/url.lua
/usr/share/lua/5.3/
/usr/share/lua/5.3/ltn12.lua
/usr/share/lua/5.3/mime.lua
/usr/share/lua/5.3/socket/
/usr/share/lua/5.3/socket.lua
/usr/share/lua/5.3/socket/ftp.lua
/usr/share/lua/5.3/socket/headers.lua
/usr/share/lua/5.3/socket/http.lua
/usr/share/lua/5.3/socket/mbox.lua
/usr/share/lua/5.3/socket/smtp.lua
/usr/share/lua/5.3/socket/tp.lua
/usr/share/lua/5.3/socket/url.lua