Set Manually IP Address (Ubuntu 14.04) Desktop env.

#sudo nano /etc/NetworkManager/system-connections/Wired\ connection\ 1
[802-3-ethernet]
duplex=full
mac-address=00:19:D1:AB:10:FA

[connection]
id=Wired connection 1
uuid=896c15c0-4542-4443-8153-72d1c1211849
type=802-3-ethernet
timestamp=1484646948

[ipv6]
method=auto

[ipv4]
method=manual
dns=192.168.5.251;192.168.5.234;
address1=192.168.5.78/24,192.168.5.1
#address2=192.168.6.78/24,0.0.0.0
#address3=192.168.7.78/24,0.0.0.0
#end


Example

dns=192.168.5.251;192.168.5.234;     (Primary_DNS;Secondary_DNS)
address1=192.168.5.78/24,192.168.5.1 (IP/Netmask,Gateway)
address2=192.168.6.78/24,0.0.0.0    (IP/Netmask,Gateway)
address3=192.168.7.78/24,0.0.0.0    (IP/Netmask,Gateway)

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