Update packages ubuntu

sudo apt update        # Fetches the list of available updates
sudo apt upgrade       # Installs some updates; does not remove packages
sudo apt full-upgrade  # Installs updates; may also remove some packages, if needed
sudo apt autoremove    # Removes any old packages that are no longer needed

Source: askubuntu.com

Update software in ubuntu

# Upgrades all applications
sudo apt-get upgrade

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