Add Emergency Swap

Swap helps with short-term memory pressure but does not replace RAM.

ls -lh /swapfile
sudo fallocate -l 512M /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
free -h

Make it persistent (add only once):

grep -n "/swapfile" /etc/fstab
echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab

Check disk space with df -h / before creating the file.