Systemctl restart networking fails after enabling ipv6

I was following this guide to fully setup ipv6 for my droplet: https://www.digitalocean.com/docs/networking/ipv6/how-to/enable/

Unfortunately when I get to the steps for restarting networking “sudo systemctl restart networking” I receive the following error:

“Job for networking.service failed because the control process exited with error code. See “systemctl status networking.service” and “journalctl -xe” for details.”

Looking at the “systemctl status networking.service” shows the following log…

---

networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor prese Drop-In: /run/systemd/generator/networking.service.d └─50-insserv.conf-$network.conf Active: failed (Result: exit-code) since Mon 2018-11-12 01:18:50 UTC; 2min 10 Docs: man:interfaces(5) Process: 2424 ExecStart=/sbin/ifup -a --read-environment (code=exited, status= Process: 2419 ExecStartPre=/bin/sh -c [ “$CONFIGURE_INTERFACES” != “no” ] && [ Main PID: 2424 (code=exited, status=1/FAILURE)

Nov 12 01:18:50 Linux-Main systemd[1]: Stopped Raise network interfaces. Nov 12 01:18:50 Linux-Main systemd[1]: Starting Raise network interfaces… Nov 12 01:18:50 Linux-Main ifup[2424]: RTNETLINK answers: File exists Nov 12 01:18:50 Linux-Main ifup[2424]: Failed to bring up eth0. Nov 12 01:18:50 Linux-Main systemd[1]: networking.service: Main process exited, Nov 12 01:18:50 Linux-Main systemd[1]: Failed to start Raise network interfaces. Nov 12 01:18:50 Linux-Main systemd[1]: networking.service: Unit entered failed s Nov 12 01:18:50 Linux-Main systemd[1]: networking.service: Failed with result 'e lines 1-18/18 (END)

Failed to bring up eth0? Bad news right? Any ideas how to resolve this? Google hasn’t seemed to give me any results that solve this issue.

Thanks in advance.