Starting with Ubuntu 17.04, the swap partition is replaced with a swap file, which makes it easy to be resized.
NOTE: Most of the commands below will require root privilege.
You can check your current swap size with
swapon -s
or
free -h
By default, the swapfile is /swapfile with file mode 600 and it belongs to the root user.
ls -lh /swapfile
If you …