How to Create a Swap File on Ubuntu 26.04

To create a swap file on Ubuntu 26.04, add a file and enable it in fstab.

Step 1 : Check RAM.

free -m

Step 2 : Check disk space.

df -h

Step 3 : Create a 2G file.

sudo fallocate -l 2G /swapfile

Step 4 : Restrict permissions.

sudo chmod 600 /swapfile

Step 5 : Format as swap.

sudo mkswap /swapfile

Step 6 : Enable.

sudo swapon /swapfile

Step 7 : Verify.

sudo swapon --show

Step 8 : Make it persistent.

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

You have created a swap file on Ubuntu 26.04.