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Why am I getting "No Space left" When using Docker Pull?

I have a VirtualBox Lubuntu image trying to run Docker, but when I try to pull a 500mb image, I get an error saying
“write /var/lib/docker/blob…: no space left on device”.

I have 80 gb virtual disk size attached, and my du -h looks like this:

Is it something to do with /cow dir? I have no idea what that is…

My docker info says it is using aufs but it is deprecated and using overlayfs if that helps. Everything is in /var/lib/docker but not sure how much is allocated to that filesyste…kind of a newb to hardware

Any help is appreciated, thanks.

A live-os started from an iso is insufficient to run docker