$ ls /usr/share/minetest/games/minetest_game/
LICENSE.txt  README.txt  game.conf  game_api.txt  menu  minetest.conf  minetest.conf.example  mods  settingtypes.txt
[user@grimnir minetest]$ minetestserver
2017-05-11 18:14:27: WARNING[Main]: system-wide share not found at "/usr/share/minetest"
2017-05-11 18:14:27: WARNING[Main]: system-wide share not found at "/usr/bin/../share/minetest"
2017-05-11 18:14:27: WARNING[Main]: system-wide share not found at "/usr/bin/.."
2017-05-11 18:14:27: [Main]: Automatically selecting world at [/home/user/.minetest/worlds/world]
2017-05-11 18:14:27: ERROR[Main]: Subgame [] could not be found.
2017-05-11 18:14:27: ERROR[Main]: ServerError: Supplied invalid gamespec