Trying to set fixed ip on LL3.8

[jimc]

I have done this on different setups but never on LL.
Anyway, I looked on the internet and found about three different ways depending on the version of Ubuntu. None of them worked.
This what I have done, open /etc/network/interfaces and made it look like this:

# interfaces(5) file used by ifup( 8) and ifdown( 8)
auto lo
iface lo inet loopback

iface enp0s10 inet static
    address 192.168.1.100
    network 192.168.1.0
    netmask 255.255.255.0
    broadcast 192.168.1.255
    gateway 192.168.1.1

Then  restart the network. That didn't work. Notice the "enp0s10" I normally use "eth0" but found this on a website somewhere.
Problem with the internet you can't tell if a thing is true or not.
Any help would be appreciated.