root@mt:~# dpkg --get-selections|grep lua
libluajit-5.1-2:amd64                           install
libluajit-5.1-common                            install
lua-socket:amd64                                install




==============================================================

21:29:23: INFO[main]:   [irc         ] ["/home/minetest/.minetest/mods/irc/init.lua"]
21:29:23: ERROR[main]: ========== ERROR FROM LUA ===========
21:29:23: ERROR[main]: Failed to load and run script from
21:29:23: ERROR[main]: /home/minetest/.minetest/mods/irc/init.lua:
21:29:23: ERROR[main]: /home/minetest/.minetest/mods/irc/irc/main.lua:1: module 'socket' not found:
21:29:23: ERROR[main]:  no field package.preload['socket']
21:29:23: ERROR[main]:  no file '/home/minetest/.minetest/mods/irc/socket/init.lua'
21:29:23: ERROR[main]:  no file '/home/minetest/.minetest/mods/irc/socket.lua'
21:29:23: ERROR[main]:  no file './socket.lua'
21:29:23: ERROR[main]:  no file '/usr/local/share/lua/5.1/socket.lua'
21:29:23: ERROR[main]:  no file '/usr/local/share/lua/5.1/socket/init.lua'
21:29:23: ERROR[main]:  no file '/usr/local/lib/lua/5.1/socket.lua'
21:29:23: ERROR[main]:  no file '/usr/local/lib/lua/5.1/socket/init.lua'
21:29:23: ERROR[main]:  no file './socket.so'
21:29:23: ERROR[main]:  no file '/usr/local/lib/lua/5.1/socket.so'
21:29:23: ERROR[main]:  no file '/usr/local/lib/lua/5.1/loadall.so'
21:29:23: ERROR[main]: stack traceback:
21:29:23: ERROR[main]:  [C]: in function 'require'
21:29:23: ERROR[main]:  /home/minetest/.minetest/mods/irc/irc/main.lua:1: in main chunk
21:29:23: ERROR[main]:  [C]: in function 'require'
21:29:23: ERROR[main]:  /home/minetest/.minetest/mods/irc/irc/init.lua:2: in main chunk
21:29:23: ERROR[main]:  [C]: in function 'require'
21:29:23: ERROR[main]:  /home/minetest/.minetest/mods/irc/init.lua:21: in main chunk
21:29:23: ERROR[main]: ======= END OF ERROR FROM LUA ========
21:29:23: ERROR[main]: Server: Failed to load and run /home/minetest/.minetest/mods/irc/init.lua
terminate called after throwing an instance of 'ModError'
  what():  ModError: Failed to load and run /home/minetest/.minetest/mods/irc/init.lua
Aborted (core dumped)