Hi,
I have a few folders containing old worlds I have created last year on a different operating system (ubuntu 14.04, now I am using Ubuntu 16.04). When I copy these old world folders into the minetest-stable-0.4 worlds folder and run the ./bin/minetest I cannot see my old worlds in the "Select world" menu. I can only see new worlds I have created last week with this new version of minetest. How can I get minetest to recognize my old worlds?