[Bug 1772941] Re: isc-dhcp-server does not listen network interfaces

[padarjohn]

It's getting to the point that I'm afraid to do updates on my Ubuntu servers anymore. :-(
I haven't had time to investigate more thoroughly, but it looks like dhcpd is being run before the network is up.
I'm running 14.04 LTS, and applied pending updates yesterday. When the system rebooted I ran into this. The system has a manually configured static IP address on a hardwired ethernet port. There's nothing wrong with the config file, in spite of the error message. 
After getting past the fact that I suddenly also couldn't directly run the init script anymore (grrrr)  and the obfuscation involved in trying to get initctrl to actually work, I was able to restart the service without issue.
I now have a server that I can't trust to boot unattended. This isn't acceptable.

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https://bugs.launchpad.net/bugs/1772941

Title:
  isc-dhcp-server does not listen network interfaces

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  System: Ubuntu 16.04.4 LTS x64 XFCE desktop
  Version of package: isc-dhcp-server
  Uname: 4.4.0-127-generic
  Result spected: service isc-dhcp-server status returning that service is active, running and OK.
  Network interfaces: 2, enp0s3 (static, main), en0s8 not configured yet.
  Current result:
  service isc-dhcp-server status returns an error message, which says that there is no network interface listening.

  In /etc/default/isc-dhcp-server I have configured this line:
  INTERFACES="enp0s3" but still giving the same error. Links to an ask ubuntu question:https://askubuntu.com/questions/536531/dhcp-server-wont-start-gives-not-configured-to-listen-on-any-interfaces-eve

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