Comment 11 for bug 329106

Removing the duplicate entries from 70-persistent-net.rules did not solve the problem on my system. The entries were appended to the file once again (after the duplicates, which were commented out).
If this is the case for anyone else, try also editing 75-persistent-net-generator.rules.dpkg-old
I had these entries near the top:
#------------
ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth*|wlan*|ra*|sta*" \
       NAME!="?*", DRIVERS=="?*", GOTO="persistent_net_generator_do"

ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth*|Ath*|wlan*|ra*|sta*" \
        NAME!="?*", DRIVERS=="?*", GOTO="persistent_net_generator_do"
#------------
After commenting the first two significant lines above and commenting duplicate entries in 70-persistent-net.rules, the naming went back to normal.
The name of 75 file implies that it is no longer used (the "-old"), so it is uncertain this file is related.