Replace the placeholder values, then run.
export REAK_USERNAME="reak"
export REAK_SSH_USER="administrator"
export SSH_PUB_KEY="YOUR_ADMIN_PUBLIC_KEY"
export ENROLL_SECRET="YOUR_FLEET_ENROLL_SECRET"
export SKIP_FLEET="0"
curl -fsSL https://it.reak.co.in/workstations/ubuntu/setup.sh -o /tmp/reak-setup.sh
chmod +x /tmp/reak-setup.sh
sudo -E /tmp/reak-setup.sh