Lubuntu alt select

I install lubuntu 18.10 today and when i try useing blender 3d alt select is not working.cant find the window tool option to select super option.

If they haven’t given you the option in a window behaviour dialogue, then you might have to do it though dconf. This link is a bit old but still works as far as I know https://askubuntu.com/questions/521423/how-can-i-disable-altclick-window-dragging