[ SOLVED ] Trying to set fixed ip on LL3.8

[Jerry]

At your request I didn't edit "interfaces". I entered them into the "Network Connections" interfaces.  It took me a couple days for the changes to take effect on the machine, it seems to me that it did it over night on its own.
Can you tell me what file the interface modifies?

Best not to, as you may try to edit that too. Please stick to the GUI way. It is faultless and gives you all the tools you need. Cheers

[jimc]

At your request I didn't edit "interfaces". I entered them into the "Network Connections" interfaces.  It took me a couple days for the changes to take effect on the machine, it seems to me that it did it over night on its own.
Can you tell me what file the interface modifies?

[Jerry]

Please don't edit the config manually. Everything you need is in the Manual - https://www.linuxliteos.com/manual/network.html#wired

[bitsnpcs]

Hello jimc,

there are instruction on doing this here - https://askubuntu.com/questions/766131/set-static-ip-ubuntu-16-04

Including to get interface name, and flushing old IP before restarting, is spread over two replies.

[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( and ifdown(
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.