ANT Landscape Addon : error when I want to valid it in "user preferences"

Hello everybody.
First, sorry if my question has been discussed here or elsewhere but I made searches yesterday and I didn’t found any reply.
I’m using blender 2.79 with Ubuntu Studio. When I try to valid in “user preferences” the ANT Landscape Addon, here is the displayed error message :
Would someone have an idea on how to solve this problem ?