Is a Master 2 Research (Europe) a University or Postgraduate Degree? I am currently applying for post-docs and for one of them, I should provide the "category" or degree/educational establishment where I have the choice between:

University degree
Postgraduate
PhD


My question is: what is the right category of a Master 2 Research (in Europe) ? 
Is it a University degree or a Postgraduate degree ?
While I would recommend you to confirm, normally a 'university degree' is an undergraduate degree. 

A postgraduate could be a postgraduate certificate, postgraduate diploma, or a postgraduate degree (which is a master degree)

I think you know what a PhD is.

In short, as master is a postgraduate (the middle of your three choices).

It seems a little strange because normally post-docs are post (after) doctorate (PhD).