Aegir Installation - how to get the sender email correct to allow install to pass
Found the answer in section 7.1 at https://docs.aegirproject.org/install/#7-install-aegir
sudo apt install debconf-utils
mkdir -p ~/projects/aegir/core
git clone https://git.drupal.org/project/provision.git ~/projects/aegir/core/provision
echo &quot;aegir3-hostmaster aegir/email string valid@email.com&quot; | sudo debconf-set-selections
sudo apt install aegir3