Add Second IP Address to Network Adaptor on Ubuntu 16.4

I need to add a second ip address to my network adaptor on Ubuntu 16.4

This makes it temporary
# ip addr add 10.5.16.79/22 broadcast 10.5.16.255 dev ens160
Need to make it permanent

vi /etc/network/interfaces

# New file
auto lo

iface lo inet loopback

auto ens160

iface ens160 inet dhcp
iface ens160 inet static
address 10.2.8.79
netmask 255.255.252.0

iface ens160 inet static
address 10.5.16.79/22

gateway 10.2.8.1

dns-nameserver 10.2.8.233 10.2.8.234
dns-search mydom.com

Save the file

run this

root@tgcs017:/usr/local/nagios/etc/objects/windowsservers# sudo ifdown ens160 $$ sudo ifup ens160
ifdown: interface ens160 not configured
Unknown interface 11748
Unknown interface sudo
Unknown interface ifup
ifdown: interface ens160 not configured

The run this
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:85:db:0b brd ff:ff:ff:ff:ff:ff
    inet 10.2.8.79/22 brd 10.2.11.255 scope global ens160
       valid_lft forever preferred_lft forever
    inet 10.5.16.79/22 brd 10.5.16.255 scope global ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe85:db0b/64 scope link
       valid_lft forever preferred_lft forever


# sudo systemctl restart networking.service
Job for networking.service failed because the control process exited with error code. See "systemctl status networking.service" and "journalctl -xe" for details.

# systemctl status networking.service
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
  Drop-In: /run/systemd/generator/networking.service.d
           └─50-insserv.conf-$network.conf
   Active: failed (Result: exit-code) since Mon 2020-11-02 21:39:54 EST; 21s ago
     Docs: man:interfaces(5)
  Process: 22644 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
  Process: 22637 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, status=0/SUCCESS)
 Main PID: 22644 (code=exited, status=1/FAILURE)

Nov 02 21:39:54 tgcs017 dhclient[22660]: DHCPACK of 10.2.8.79 from 10.2.8.234
Nov 02 21:39:54 tgcs017 ifup[22644]: DHCPACK of 10.2.8.79 from 10.2.8.234
Nov 02 21:39:54 tgcs017 ifup[22644]: RTNETLINK answers: File exists
Nov 02 21:39:54 tgcs017 ifup[22644]: bound to 10.2.8.79 -- renewal in 266932 seconds.
Nov 02 21:39:54 tgcs017 ifup[22644]: RTNETLINK answers: File exists
Nov 02 21:39:54 tgcs017 ifup[22644]: Failed to bring up ens160.
Nov 02 21:39:54 tgcs017 systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Nov 02 21:39:54 tgcs017 systemd[1]: Failed to start Raise network interfaces.
Nov 02 21:39:54 tgcs017 systemd[1]: networking.service: Unit entered failed state.
Nov 02 21:39:54 tgcs017 systemd[1]: networking.service: Failed with result 'exit-code'.

Not a Linux guy here need some help on this

Any ideas or suggestions?

Thank you

Tom