upgrade ubuntu from command line code example

Example 1: update ubuntu

sudo apt update && sudo apt upgrade -y
#or use it seperately
sudo apt update
sudo apt upgrade
#you make wanna run below command to remove unwanted
#and free up some space
sudo apt autoremove

Example 2: how to update ubuntu from terminal

# for updating the whole OS
apt-get upgrade
# for updating application repositories (from where you download applications)
apt-get update