Check out example codes for "update ubuntu in terminal". It will help you in understanding the concepts better.
Code Example 1
#gets package(s) update definitions sudo apt update #upgrades the package(s) for which update definitions are received sudo apt upgrade
Code Example 2
# "To update Linux type:" sudo apt-get update # Enter your user's password.
Code Example 3
Code Example 4
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
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