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As my built-in NIC was not supported by Ubuntu out-of-the-box I was forced to use a USB NIC for temporary installation-time Internet connection.

And the USB NIC has taken the eth0 name making the built-in NIC to become eth1.

Sure, this doesn't really matter but just for the system "prettiness" I would like eth1 to become eth0 letting any newly attached NIC to become eth1.

Is this possible?

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It is possible. Please do:

gksudo gedit /etc/udev/rules.d/70-persistent-net.rules

Swap eth0 and eth1. Proofread carefully, save and close gedit. Use any other text editor if you don't have gedit. Reboot immediately and you should be all set.

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... and first make a backup of the file – Rinzwind Nov 15 '12 at 15:55

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