VMware Workstation made me do it :-)
Seriously, VMware was suggesting that I double my swap from 2 GB to 4 GB, so this is what I did: -
Report what's there
sudo swapon -s
FilenameTypeSizeUsedPriority
/swapfile file 20971480-1
Turn the swap file off
sudo swapoff /swapfile
Increase the space allocated to the swapfile
sudo fallocate -l 4G /swapfile
Initialise the swapfile
sudo mkswap /swapfile
mkswap: /swapfile: warning: wiping old swap signature.
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=9472dbc9-7575-491f-b00f-23c4ca30f22b
Turn the swap file on
sudo swapon /swapfile
Report what's there
sudo swapon -s
FilenameTypeSizeUsedPriority
/swapfile file 4194300 0 -1
FilenameTypeSizeUsedPriority
/swapfile file 20971480-1
Turn the swap file off
sudo swapoff /swapfile
Increase the space allocated to the swapfile
sudo fallocate -l 4G /swapfile
Initialise the swapfile
sudo mkswap /swapfile
mkswap: /swapfile: warning: wiping old swap signature.
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=9472dbc9-7575-491f-b00f-23c4ca30f22b
Turn the swap file on
sudo swapon /swapfile
Report what's there
sudo swapon -s
FilenameTypeSizeUsedPriority
/swapfile file 4194300 0 -1
With thanks to this: -