install ext-mbstring ubuntu 18.04 code example

Example 1: ubuntu install ext-mbstring

sudo apt install php7.2-mbstring

Example 2: como instalar ext-mbstring en ubuntu 18.04

deb http://archive.ubuntu.com/ubuntu bionic main multiverse restricted universe
deb http://archive.ubuntu.com/ubuntu bionic-security main multiverse restricted universe
deb http://archive.ubuntu.com/ubuntu bionic-updates main multiverse restricted universe