Adjust swap (page) file size Kubuntu 22.04

adjust_swap.sh

#!/bin/sh

# First check to see that swap file is in use, and what size it is
free -h
sudo swapoff -a

ls -al /swapfile
# Too lazy to make a proper interface, just edit the "8GB" to preferred size
sudo fallocate -l 8G /swapfile
# Should now show new size
ls -al /swapfile
# Optional (it should still be 600 from before)
#sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

# Ensure fstab contains `/swapfile swap swap defaults 0 0` (space count doesn't matter, but do not use tabs)
sudo cat /etc/fstab