Comment 10 for bug 1466790

> Could it be that something about keeping daemons started during ifup running be accidentally dropped?

Not that I know of, and in my wily VMs dhclient runs happily.

I don't know whether ifupdown has some useful debugging facilities. I tried adding /usr/bin/strace -fvvs1024 -o /run/ifup.trace to /etc/init.d/networking, but it doesn't give much information (in particular, it doesn't end up calling dhclient). Do you get anything useful if you set VERBOSE=yes in /etc/default/networking and reboot? (Please attach journal again)