Minetest no longer bundles it's default subgame in the package by default
The latest update removed the default subgame from packages, so such subgame must be installed manually or from content db as the game no longer bundles the subgame by default. The subgame then must be installed by creating a new games folder in the minetest <share> folder if it does not exist and then putting subgame files to <share>/games/minetest_game, where <share> is ~/.minetest, /usr/share/minetest, /path/to/minetest, etc. depending on your system. Found out about this since after a few recent software updates my minetest server would fail with error during it's startup as such game could not be found. Had to include manual installation of subgame files within game server update scripts so server would continue working again.