ubunut 18.04 ip confug code example
Example 1: install ifconfig on ubuntu
apt-get update
apt-get install net-tools
Example 2: ifconfig not found ubuntu 20.04
#installation
$ sudo apt install net-tools
#Then use it
$ ifconfig
apt-get update
apt-get install net-tools
#installation
$ sudo apt install net-tools
#Then use it
$ ifconfig