Bug#789439: similar case

[Peter Eisentraut]

While looking into a similar case I found this bug report.

I brought up the debian/jessie64 vagrant image and upgraded it to sid.
The starting setup contains a /etc/network/interfaces file that refers
to eth0:

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
pre-up sleep 2

After upgrading and rebooting, the interface appears as enp0s3 instead
and the network does not come up.

To be fair, the NEWS.Debian entry for udev says "If you have ifupdown
... configuration that relies on old names", but I doubt that many
normal users will be able to interpret that.

I also tried it a different way: I installed the jessie netinst "CD"
into a new virtualbox machine, upgraded it to sid, rebooted, but there
the network came up as eth0 again.  This is doubly confusing.