Fixing docker does not want to update images

If you run docker pull, and you see an error like
failed to register layer: Error processing tar file(exit status 2): fatal error: runtime: out of memory, there could be 2 reasons.
Obvious one — not enough disk space for docker. You can fix it with

WARNING: It will remove your unused resources like images and volumes for the containers that are not running at the moment.

Not that obvious one: if you are using swap file, your swap file can be full.
You can check it with one of the commands:

It means you need to increase it.
Here is the article on how to do it —

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