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After upgrading from 3.11 to 3.13.0 networking no longer worked. My interface, bond0, came up without errors but the server was unreachable. Logging in locally and digging around I saw that: /sys/class/net/bond0/bonding/slaves was empty. Running the following two commands by hand solves the problem and the network starts working:

ifenslave bond0 eth0
ifenslave bond0 eth1

It seems to me that this should be managed automatically by ifupdown-ng. I did some extensive searching, trying to figure out if the syntax of /etc/network/interfaces has changed, but could not figure out if it had. The admin guide for ifupdown-ng on their own github page did not provide further help.

For reference, my interfaces file looks as follows, which worked fine before the upgrade:

auto lo
iface lo inet loopback

auto bond0
iface bond0 inet dhcp
        bond-slaves eth0 eth1
        hostname nas
        bond-mode 2