I'm following this guide on installing Kivy. Step 2 is
- Update your packagelist using your package manager
I'm very new to Ubuntu/Linux and don't know how.
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Because you've already opened a terminal, with a simple command
sudo apt-get update
That's always necessary if you have done something like:
sudo add-apt-repository ppa:kivy-team/kivy
update update is used to resynchronize the package index files from their sources. The indexes of available packages are fetched from the location(s) specified in /etc/apt/sources.list. For example, when using a Debian archive, this command retrieves and scans the Packages.gz files, so that information about new and updated packages is available. An update should always be performed before an upgrade or dist-upgrade. Please be aware that the overall progress meter will be incorrect as the size of the package files cannot be known in advance.