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debian static network
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1. set a static ip
2. stop the desktop gui from changing your network settings


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/etc/network/interfaces
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source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

allow-hotplug enp0s3
iface enp0s3 inet static
        address 192.168.100.101
        gateway 192.168.100.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 1.1.1.1 1.0.0.1



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/etc/NetworkManager/NetworkManager.conf
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[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false