I have installed a linux server and it works just great, joining and playing. But if we want the server too change map, or rather return back to the first startup map (the one with options to choose from 1v1, 4v4, tricks etc), how do we so that? The only method I found so far is for all players to disconnect and rejoin the server.

Hi!
set k_defmap maphub_v1
in ktx.cfg

If you've changed the map and want to get back to the hub map, votemap "maphub_v1" which is its name.