Etc/apt/sources.list file

I thought if I added the source as a file in the directory, it will be seen as a package source. What else do I need to do? This answers your question, however, it won't solve your problem. APT is complaining about a missing GPG key which you have to manually import before you can use your newly added repository GPG verifies all data cryptographically and needs the public keys of the owners for this. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Ask Question. Asked 9 years, 3 months ago. Active 2 years, 11 months ago. Viewed k times. I am updating my Tor on Ubuntu and it states: Do not use the packages in Ubuntu's universe. Improve this question. Braiam Add a comment. Active Oldest Votes.

Make a backup copy of your current sources. Save and close sources. Improve this answer. In order to add a third-party repository, you first need the public keys for this repository which in this case you can grab from the Ubuntu key server: sudo apt-key adv --recv-keys --keyserver keyserver.

Community Bot 1. This will ensure your apt index is synchronized. Then you can install new packages from the repository. For example, to install docker on Debian 9 from its upstream repository, you'll do:. You can then proceed to update apt-cache and install docker package from it. This is a recommended way to add any other third party repositories. When working with apt and sources. This is usually done using the command apt-key, whose syntax is.

In general, working with sources. The only thing you have to be keen on is putting the right Distribution. In a repository, we have organized set of binary and sources packages. The repositories also contains files which have all the information about available packages. So, we could get list of packages available and their versions, information about their maintainers etc.

Hence, we could decide what all packages need to be installed on our system. Restricted — These contain proprietary drivers for various devices. Additional Info — It is worth mentioning here that, installing a package through repository offers its own set of advantages.