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6.1. Extra Repositories


In addition to the officially supported package repositories available for Ubuntu, there exist additional community-maintained repositories which add thousands more packages for potential installation. Two of the most popular are the Universe and Multiverse repositories. These repositories are not officially supported by Ubuntu, but because they are maintained by the community they generally provide packages which are safe for use with your Ubuntu computer.


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Packages in the Multiverse repository often have licensing issues that prevent them from being distributed with a free operating system, and they may be illegal in your locality.


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Be advised that neither the Universe or Multiverse repositories contain officially supported packages. In particular, there may not be security updates for these packages.


Many other package sources are available, sometimes even offering only one package, as in the case of package sources provided by the developer of a single application. You should always be very careful and cautious when using non-standard package sources, however. Research the source and packages carefully before performing any installation, as some package sources and their packages could render your system unstable or non-functional in some respects.


By default, the Universe and Multiverse repositories are enabled but if you would like to disable them edit / etc/apt/sources.list and comment the following lines:


deb http://archive.ubuntu.com/ubuntu bionic universe multiverse

deb-src http://archive.ubuntu.com/ubuntu bionic universe multiverse


deb http://us.archive.ubuntu.com/ubuntu/ bionic universe

deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe

deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe

deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe


deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse



deb-src http://us.archive.ubuntu.com/ubuntu/ bionic multiverse

deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse


deb http://security.ubuntu.com/ubuntu bionic-security universe

deb-src http://security.ubuntu.com/ubuntu bionic-security universe deb http://security.ubuntu.com/ubuntu bionic-security multiverse

deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse


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