In this article, we’ll cover the simple steps to remove an apt repository in Ubuntu. While updating the Ubuntu system using the apt command, we may come across a scenario where some old repositories cause errors. The only feasible option that remains is to remove such repositories. In this article, we will demonstrate command-line as well as GUI methods to remove an apt repository or PPAs (Personal Package Archives).
How to remove an apt repository in Ubuntu
Let’s go over the steps that you’d need to take to remove an apt repository.
1. Using the apt command
This might not come as a surprise to any Ubuntu user that this task can be achieved by using the all powerful apt command. It can be done by:
sudo add-apt-repository --remove ppa:<PPA_NAME>
To remove a specific repository, we need to know the exact name of the PPA involved. Not every user is aware of the names of the repository present on the system, therefore Ubuntu has a command to list the repositories.
apt policy
The number before the name of repository is a priority number.
2. Using the ppa-purge command
As the name of the command name suggests, it specifically deals with removing repositories in Linux systems. Since this is not a system built-in function, we’ll install the package using the apt command:
sudo apt install ppa-purge
After installing the tool, we can run:
sudo ppa-purge ppa:<PPA_NAME>
3. Removing a repository from ‘apt directory’
Like every other configuration in Linux, repositories are stored in the system as a file. Instead of using predefined commands, we can remove these repositories manually.
These repositories are stored in 'etc/apt/source.list.d/' in the form of '.list' files. Before removing any repository, we can list the contents of the directory by using the ls command:
The 'ls' command is used to display the contents of any directory in a Linux system. We have a complete documentation on ls command. From the repository files, we can choose the ones we wish to remove.
According to the permissions displayed at the start of each line, we need elevated privileges to remove these files:
sudo rm /etc/apt/sources.list.d/<Repo_Filename>.list
The 'rm' command is responsible for removing files from command line.
This basically sums up all the ways to remove repositories using the command-line.
4. Removing a repository using ‘Software and Updates’
There is no easier method to remove a repository than using a GUI-based application. To do the required, we open “Software and Updates” in Ubuntu.
In the “Other Software” section of the application, we can see a list of repositories in Ubuntu.
Selecting and pressing the “Remove” button will bring up the “Authentication” screen.
After entering the password and clicking “Authenticate,” we are done with dealing with the specific repository.
Note on removing apt repository by deleting its keys
Ubuntu does not advocate removing an apt repository by deleting its keys. The keys are used for authentication and verification, and deleting them may result in system issues. That being said, if it is absolutely necessary, the following procedures can be taken and don’t say we didn’t warn you in case of a system failure due to this procedure:
- To launch the terminal, press “Ctrl + Alt + T” on the keyboard
- Execute the following command to list the repository-associated keys on your system:
sudo apt-key list
- Locate the key associated with the repository you wish to delete, and record its ID
- Execute the command below to delete the key:
sudo apt-key del <key-id>
- Replace <key-id> with the ID of the key to be removed
- Run the following command to remove the repository item from the sources.list file:
sudo nano /etc/apt/sources.list
- This will allow access to the sources.list file in the nano text editor. Delete the line containing the repository you wish to delete, and then save the file by hitting “Ctrl + X,” “Y,” and “Enter.”
Here’s in-depth documentation on apt-key, the APT key management utility tool that you can educate yourself with if you are still planning to go with the procedure above.
Summary
The task of removing any repository is not difficult. The Graphic-based method is very convenient and saves time. Whether you use the apt command, ppa-purge, manually delete repository files, or the GUI-based approach, the process is straightforward and accessible to all users. Yet, there is no harm in learning about new things and commands in Linux. By eliminating obsolete or unnecessary repositories, you may be sure of a seamless and error-free update of the Ubuntu operating system.