Installation of Kivy garden

I'm working on my python app with Kivy 1.10.0 under Ubuntu.I tried various times to install some packages from Kivy garden and followed these official instructions:https://kivy.org/docs/api-kivy.garden.html

When I enter pip install kivy-gardenit says:

Requirement already satisfied: kivy-garden in ./.local/lib/python2.7/site-packages Requirement already satisfied: requests in ./.local/lib/python2.7/site-packages (from kivy-garden) Requirement already satisfied: urllib3<1.23,>=1.21.1 in ./.local/lib/python2.7/site-packages (from requests->kivy-garden) Requirement already satisfied: idna<2.7,>=2.5 in ./.local/lib/python2.7/site-packages (from requests->kivy-garden) Requirement already satisfied: chardet<3.1.0,>=3.0.2 in ./.local/lib/python2.7/site-packages (from requests->kivy-garden) Requirement already satisfied: certifi>=2017.4.17 in ./.local/lib/python2.7/site-packages (from requests->kivy-garden)

But when I try to install a package in the next step with for example:

garden install graph

it always just says

The program 'garden' is currently not installed. You can install it by typing: sudo apt install garden-of-coloured-lights

I really can't figure out what the problem is and can't find proper help in the web. Do you see any mistake?

Thanks