As per
https://lists.ubuntu.com/archives/xubuntu-devel/2017-January/011416.html
While I have no doubt that Xubuntu will 'run' with 512MB of RAM - I'd
not personally like to do so with the increasing requirement that
applications (browsers for instance) place upon a system.
Even a vm Xubuntu has used 305MB according to free -m without anything
started.
Better to up that minimum to at least 1024MB.
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