Where to find sources.list ubuntu

Caution: To avoid trouble with your sytem, only add repositories that are trustworthy and that are known to work on Ubuntu systems! You can add custom software repositories by adding the apt repository line of your software source to the end of the sources. This command is similar to "addrepo" on Debian. The command updates your sources. Type man add-apt-repository for detailed help.

If a public key is required and available it is automatically downloaded and registered. Should be installed by default. You can then revert your changes if needed. If you decide to add other repositories to sources. Repositories that are not designed to work with your version of Ubuntu can introduce inconsistencies in your system and might force you to re-install.

Also, make sure that you really need to add external repositories as the software package s you are looking for may already have been introduced into the official repositories!

Format, syntax and names of the options vary between the one-line-style and debstyle formats as described, but they both have the same options available. For simplicity we list the deb fieldname and provide the one-line name in brackets. Remember that besides setting multivalue options explicitly, there is also the option to modify them based on the default, but we aren't listing those names explicitly here.

Unsupported options are silently ignored by all APT versions. If this option isn't set the default is all architectures as defined by the APT::Architectures config option. If this option isn't set the default is all languages as defined by the Acquire::Languages config option. If not specified, the default set is defined by the Acquire::IndexTargets configuration scope. Additionally, specific targets can be enabled or disabled by using the identifier as field name instead of using this multivalue option.

The value of this option is ignored if the repository doesn't announce the availability of PDiffs. Defaults to the value of the option with the same name for a specific index file defined in the Acquire::IndexTargets scope, which itself defaults to the value of configuration option Acquire::PDiffs which defaults to yes. Using this can avoid hashsum mismatches, but requires a supporting mirror.

Defaults to the value of the option of the same name for a specific index file defined in the Acquire::IndexTargets scope, which itself defaults to the value of configuration option Acquire::By-Hash which defaults to yes.

Furthermore, there are options which if set affect all sources with the same URI and Suite, so they have to be set on all such entries and can not be varied between different components. APT will try to detect and error out on such anomalies.

This option can be used to override that decision. The value yes tells APT always to consider this source as trusted, even if it doesn't pass authentication checks. It disables parts of apt-secure 8 , and should therefore only be used in a local and trusted context if at all as otherwise security is breached.

The value no does the opposite, causing the source to be handled as untrusted even if the authentication checks passed successfully. The default value can't be set explicitly. If the option is set, only the key s in this keyring or only the key with this fingerprint is used for the apt-secure 8 verification of this repository.

Otherwise all keys in the trusted keyrings are considered valid signers for this repository. A repository creator can declare a time until which the data provided in the repository should be considered valid, and if this time is reached, but no new data is provided, the data is considered expired and an error is raised. Besides increasing security, as a malicious attacker can't send old data forever to prevent a user from upgrading to a new version, this also helps users identify mirrors which are no longer updated.

To display a list of packages satisfying certain criteria such as show matching apache2 packages, run apt list apache. You can use yum -v search that would show you packages along with repo it is present in.

If you also add —showduplicates you will see all versions of that package. Skip to content Android Windows Linux Apple. Home » Linux. See also Quick Answer: Where is interfaces in Ubuntu? See also Is GB enough for Windows 10? See also Your question: How do you make manjaro stable? Like this post? Please share to your friends:.