Debian users may leverage the same source as the Ubuntu PPA.
Add the following line to /etc/apt/sources.list`:
deb http://ppa.launchpad.net/ansible/ansible/ubuntu trusty main
Set apt keys
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 93C4A3FD7BB9C367
$ sudo apt update
$ sudo apt install ansible
Configure 'sshd_config'
sudo vi /etc/ssh/sshd_config
PasswordAuthentication yes
Restart the 'sshd' service
sudo service sshd restart
OR
sudo systemctl restart sshd
Create a user for ansible
sudo useradd ansadmin
sudo passwd ansadmin
Add to sudo with NOPASSWD
sudo visudo
#add follwoing line
ansadmin ALL=(ALL) NOPASSWD: ALL