What does apt-get update do?

What does apt-get update do?

The sudo apt-get update command is used to download package information from all configured sources. The sources often defined in /etc/apt/sources. So when you run update command, it downloads the package information from the Internet. It is useful to get info on an updated version of packages or their dependencies.

What is the purpose of apt-get command in Linux?

apt-get is a command-line tool which helps in handling packages in Linux. Its main task is to retrieve the information and packages from the authenticated sources for installation, upgrade and removal of packages along with their dependencies. Here APT stands for the Advanced Packaging Tool.

How update apt-get Linux?

1. Install. Using apt-get install will check the dependencies of the packages you want and install any that are needed.
2. Search. Use apt-cache search to find what’s available.
3. Update. Run apt-get update to update all your package lists, followed by apt-get upgrade to update all your installed software to the latest versions.

When should I use apt update?

You need to run apt-get update once before installing new packages as this updates the local repository information. If you are going to install multiple packages shortly after each other, you do not need to run apt-get update before each install; just once before the first install.

Should you run apt upgrade?

Generally, yes this is safe. For critical packages, though (Postgres, Nginx, etc.), I’d recommend pinning those packages to a specific version so that they do not get updated.

What does apt list do?

Listing Packages ( apt list ) The list command allows you to list the available, installed and, upgradeable packages. The command will print a list of all packages, including information about the versions and architecture of the package.

Should I run Apt-Get Update before or after installing a package?

Because information about what updated versions of packages are available is obtained by running sudo apt-get update (or sudo aptitude update ), it is advisable to run this before installing any package, and necessary to run it to install the latest updates, even if you have not added or removed any Software Sources (such as a PPA).

Where does apt-get get the list of available packages?

The indexes of available packages are fetched from the location (s) specified in /etc/apt/sources.list (5). An update should always be performed before an upgrade or dist-upgrade. apt-get upgrade will fetch new versions of packages existing on the machine if APT knows about these new versions by way of apt-get update.

What does sudo apt-get update do in Ubuntu?

Running sudo apt-get update simply makes sure your list of packages from all repositories and PPA’s is up to date. If you do not run this command, you could be getting older versions of various packages you are installing, or worse, dependency issues.

What does aptapt-get update actually do?

apt-get update downloads the package lists from the repositories and “updates” them to get information on the newest versions of packages and their dependencies. It will do this for all repositories and PPAs.