replace dnsmasq-base with unbound

replace dnsmasq-base with unbound.txt

#remove dnsmasq-base without removing network-manager, don't use "apt-get remove"
#but apt-get will be held, so need no do this line
sudo dpkg --remove --force-all dnsmasq-base

#kill dnsmasq to release the port 53
sudo kill -SIGHUP $(cat /var/run/dnsmasq/dnsmasq.pid)

#confirm /etc/resolv.conf is:
nameserver 127.0.0.1

sudo gedit /etc/NetworkManager/NetworkManager.conf
#replace:
dns=dnsmasq
#with:
dns=unbound

sudo apt-get install unbound

sudo gedit /etc/unbound/unbound.conf:
server:
    #auto-trust-anchor-file: "/var/lib/unbound/root.key"
    tcp-upstream: yes

forward-zone:
    name: "."
    forward-addr: 8.8.4.4