To utilize this module, the installed version ofthe openstacksdk library MUST be >=0.12.0"

[andruwa13]

Ubuntu 16.04/18.04
ansible 2.8.4
Vagrant 2.2.5
Virtulbox 6.0.12
Git Branch Master
TASK [os_keystone_service : get an admin token]

[gyurco]

This comes from Ansible, you must have the correct version for this module installed on your host system. Or downgrade Ansible.
On Ubuntu 16.04, pip install openstacksdk == 0.12.0 (or similar, didn't check the right syntax) should do the job with recent Ansible versions.

[andruwa13]

@gyurco not work :(

[gyurco]

Check in the guest system, too, I'm not sure what version is installed with Ubuntu 18.04 by default.