Letting the installer take care of the whole networking seems to work here:
### Network configuration
# netcfg will choose an interface that has link if possible. This makes it
# skip displaying a list if there is more than one interface.
-d-i netcfg/choose_interface select eth0
+## d-i netcfg/choose_interface select eth0
Letting the installer take care of the whole networking seems to work here:
### Network configuration choose_ interface select eth0 choose_ interface select eth0
# netcfg will choose an interface that has link if possible. This makes it
# skip displaying a list if there is more than one interface.
-d-i netcfg/
+## d-i netcfg/