No network after ubuntu upgrade to 16.04

Upgraded ubuntu in droplet (do-release-upgrade). Currently it is 16.04 Logged in.

#ping -c3 
ping: unknown host
sudo service networking status
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)

Do not know why it was masked but I did unmask. And then again

sudo service networking status
networking.service - LSB: Raise network interfaces.
Loaded: loaded (/etc/init.d/networking: bad; vendor preset: enabled)
Drop-In: /run/systemd/generator/networking.service.d
Active: active (exited) since Sat 2018-08-11 15:04:02 MSK; 16 min ago
Docs: man:systemd-sysv-generator(8)
Process: 943 ExecStop=/etc/init.d/networking stop (code=exited, status=0/SUCCESS
Process: 946 ExecStart=/etc/init.d/networking start (code=exited, status=0/SUCCESS

cat /etc/network/interfaces

auto lo
iface lo inet loopback

auto ens3
iface ens3 inet static
    address 162.243.XX.XX
    gateway 162.243.XX.1

ifconfig - a

ens3  Link encap:Ethernet  HWaddr 00:1b:fc:2d:21:3b  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:38337 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38337 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:3591223 (3.5 MB)  TX bytes:3591223 (3.5 MB)

As I understand, networking service is not working properly. There is nothing in /var/log/syslog or in journalctl -u NetworkManager

I did

sudo ip addr flush dev ens3

sudo service networking restart

But no ip address appear in ens3 interface

Any help appreciated


This does not help me in my issue.

do-release-upgrade never worked for me.

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Were you able to resolve this? I’m getting the same error after upgrading to 18.04