Move/add swap partition in Ubuntu

    To see the amount of existing swap space:

cat /proc/meminfo |grep -i swap

The output should be something like below. Full explanation of /proc/meminfo here.

SwapCached:  2244 kB
SwapTotal:  1052248 kB
SwapFree:  1043908 kB

 If you want to add a new swap partition, or delete the existing one and create another:

sudo swapoff -a
sudo mkswap /dev/sda3
#Edit fstab to add the UUID given by sudo blkid command. Then:
sudo swapon -a
#Check
swapon -s

References:

1. /proc/meminfo Explained