Ubuntu 18.04 add multiverse and universe repositories

1. Open the file /etc/apt/sources.list

2. Add the following lines:

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

3. Save the file.

4. Launch the following command to update the packages

sudo apt update