Enabling the Swap File

sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon --show

Check swap
free -h

Make the Swap File Permanent

Back up the /etc/fstab file in case anything goes wrong:
sudo cp /etc/fstab /etc/fstab.bak

echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab