Hi Spinscale,
yes, I´ve done every single step. This is why I`m really confused.
Thanks for your fast reply.
If I check the available keys I can find it in the apt-key list:
pub rsa2048 2013-09-16 [SC]
4609 5ACC 8548 582C 1A26 99A9 D27D 666C D88E 42B4
uid [ unkown] Elasticsearch (Elasticsearch Signing Key) <dev_ops@elasticsearch.org>
sub rsa2048 2013-09-16 [E]
/etc/apt/trusted.gpg.d/ansible_ubuntu_ansible.gpg