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Ubuntu Unleashed 2015 Edition: Covering 14.10 and 15.04, Tenth Edition by Matthew Helmke

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Day-to-Day Usage

To enable you to search for packages both quickly and thoroughly, APT uses a local cache of the available packages. Try running this command:

matthew@seymour:~$ sudo apt-get update

The apt-get update command instructs APT to contact all the servers it is configured to use and download the latest list of file updates. If your lists are outdated, it takes a minute or two for APT to download the updates. Otherwise, this command executes it in a couple of seconds.

After the latest package information has been downloaded, you are returned to the command line. You can now ask APT to automatically download any software that has been updated, using this command:

matthew@seymour:~$ ...

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