Change default IP range settings for network sharing

When use network sharing along with k8s things could go wrong. Ubuntu uses 10.42.0.1/24 which interferes with k8s routing table. It has a larger metric value so the network will be shadowed.

To fix it you do not use ip route or ip addr. You use nmcli.

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nmcli # check all connections
nmcli device modify <shared_device> ipv4.addr <non_conflict_ip_range>

Remember to unplug and replug the cable from client side.

Make desktop ubuntu headless

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sudo apt-get purge libx11.* libqt.*
sudo apt-get autoremove -y
sudo apt-get clean