==> default: stdin: is not a tty

If you're using Vagrant with Ubuntu and getting this annoying (but not impactful) error during provisioning, Just paste this into your Vagrantfile as the first provisioner:

config.vm.provision "fix-no-tty", type: "shell" do |s|
    s.privileged = false
   
s.inline = "sudo sed -i '/tty/!s/mesg n/tty -s \\&\\& mesg n/' /root/.profile"
end