Things to do after installing Linux Debian Buster or Stretch

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade && sudo apt-get autoremove

su -
apt-get install sudo
adduser "USERNAME" sudo
apt-get update
apt-get upgrade
reboot

Configure non-free repositories

Open /etc/apt/sources.list using Nano text editor:

sudo nano /etc/apt/sources.list

//Add contrib non-free after main
example 
deb http://deb.debian.org/debian/ buster-updates main non-free contrib


sudo apt update
sudo apt upgrade
sudo reboot

sudo nano /etc/default/grub
sudo update-grub

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