Setup static ip address on Ubuntu 20.04.1

sudo vim /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
dns-nameservers 192.168.0.1
dns-search google.bg

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sudo vim /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    eth0:
#      dhcp4: true
      addresses: [192.168.0.100/24]
      gateway4: 192.168.0.1
      nameservers:
        addresses: [192.168.0.1]
  version: 2

sudo netapply try
# sudo netapply

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nmap 192.168.1.0/24
sudo nmap 192.168.1.0/24
nmap -sn 192.168.1.0/24
sudo nmap -sn 192.168.1.0/24
sudo nmap -Pn 192.168.1.100