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Is it necessary to run the command sudo apt-get update each time after installing any software/application?
sudo apt-get update
I know the use of this command. I just want to know when to use it.
No, you should run it before installing or upgrading any application (or other package) to ensure that you get the current version.
Before installing software.
sudo apt update updates the list of available packages and their versions, but it does not install or upgrade any packages.
sudo apt update