How to Update Ubuntu Linux

Command Line Interface

1. 
   Update your repository list. You can do this by pressing Ctrl+Alt+T. Then type in sudo apt-get update. You will be prompted for your root password. All this command does is updates the list of programs in your repository.

   1. Some distros do this automatically.
2. 
   Install upgrades. After apt-get is done, run sudo apt-get upgrade. Again, enter your password and wait 2-3 seconds. You will see a list of packages which should be installed to upgrade.

   1. You can upgrade individual packages as follows: sudo apt-get upgrade firefox.
      
3. 
   Confirm your command. You will be asked if you want to upgrade those packages, if yes, press Y and hit ↵ Enter. If you don't want to upgrade then press N and press ↵ Enter to abort.
4. 
   Apt-get will now download and install all of these packages. Bear in mind that this can be a very large download, and might take a considerable time, depending on your internet connection speed.