org.ystia.ansible.linux.ansible.nodes.AnsibleRuntime installation fails on Ubuntu 18.04

[laurentganne]

TOSCA component org.ystia.ansible.linux.ansible.nodes.AnsibleRuntime installation fails on Ubuntu 18.04 with the error:

No package matching 'python2' is available

The corresponding requirements at https://github.com/ystia/forge/blob/develop/org/ystia/ansible/linux/ansible/playbooks/vars/Debian-py2.yml contain package python2 and python2-dev that don't exist in Ubuntu 18.04