While Linux distributions like Fedora and Mageia have adopted predictable/persistent network interface names, Ubuntu has not. However, that is looking to change and it might also be the case for upstream Debian.
Links:
[1] http://www.tuxmachines.org/taxonomy/term/103
[2] http://www.tuxmachines.org/taxonomy/term/121
[3] http://www.phoronix.com/scan.php?page=news_item&px=Ubuntu-Persistent-Net-Names