![]() In case that you add a PPA to the software repositories, updating them is mandantory. It is recommended to update them every time before installing new packages. Generally it is enough to update the repository once a day.īut as the updates are pushed irregularly to the Ubuntu repositories, It is impossible to predict how often it changes, in general, without reference to a specific issue or bug report, or without following the development of that Ubuntu release. ![]() The package list changes whenever a package is upgraded on the mirror. A special case of this is when the package lists are up to date, which is after a reasonably short time since the last apt-get update this means that all packages on the mirror are the same version as they were. sudo apt-get update (for updating a package) sudo apt-get upgrade (for upgrading a package) apt-get help (to know more about a command ). I guess you already know that Ubuntu is derived from Debian Linux. A cache update can be forced by appending -refresh to other commands, e.g. This command is rarely needed, as dnf updates its package cache automatically when it is stale. This makes managing packages easier on Debian-based distros. The apt install works for both install and upgrade single package if already installed. However, it is not necessary, if you know that no new version of that package and of its dependencies have been made available on the mirrors since the last apt-get update. The apt-get is a set of command line tools that allow you to install, remove and update deb packages installed via the APT (Advanced Package Tool) in Debian and Ubuntu. There is no reason not to run apt-get update before installing a package. It is essential before upgrading the installed packages, because the system cannot know whether the repo has a new version of a package, unless it has an up-to-date copy of the package list. Of course, apt-get update is necessary after you have changed the repositories, because the system needs to download the list for the new repositories. If you don't do it before an installation, apt-getmight complain that it cannot find the package in the repository, because it computed the URL based on an old version of the list (which listed an older version of the package). When you install a package, apt-get reads the list and determines the URL of the package to download (which typically contains package version information).Īpt-get update updates the package lists. Before installing software, you should update your package list. Your copy of Ubuntu has a private copy of the list of packages that are in Ubuntu's repositories. APT keeps a list of software sources on your Raspberry Pi in a file at /etc/apt/sources.list.
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