Установите Ruby
$ sudo apt-get install ruby-full
Testy Turtle
$ sudo apt-get install ruby-full
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf
sudo apt-add-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get install ruby2.5 ruby2.5-dev build-essential dh-autoreconf