Ubuntu docs (which often disappoint me with their lack of information/organization) say:
Quote:
As you enter this step, if the system detects that you have more than one network device, you'll be asked to choose which device will be your primary network interface, i.e. the one which you want to use for installation.
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= the internet NIC, it does matter, and also needs configure (I assume bridging and such) post-install.