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I am experiencing a problem with one repository not having a release file. For that reason, I would like to remove it, but I can't find the Software and Updates app in the OS to select and remove the repo in the GUI. How can I remove it in Elementary OS 7?

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The Software and Updates app does not (to the best of my knowledge) allow a person to work with the sources list directly in Horus. That said, you can take care of this via the Terminal. Here's how:

  1. Open the Terminal application
  2. Change to the directory containing apt's sources.list file:
    cd /etc/apt
    
  3. Edit the sources.list file to remove (or comment out) the repository that does not have a release file:
    sudo {editor of choice} sources.list 
    
    Note: Be sure to replace {editor of choice} with your preferred text editor.
  4. Find the repo that needs to be removed and add a # to the start of the line, or remove it completely.
  5. Save the file and exit
  6. Update apt:
    sudo apt update
    

If the repository that you need to remove is not found in sources.list, then it will be contained in a file within the /etc/apt/sources.list.d directory, possibly in its own definition file.

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  • Thank you. The offending repo was for elementary-tweaks and the definition file was in the second location you referenced. I really appreciate your guidance on this.
    – Bob Reed
    May 2, 2023 at 14:02
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    As a sidenote, you can use Pantheon Tweaks for elementary OS 7, github.com/pantheon-tweaks/pantheon-tweaks ; elementary-tweaks is no longer supported
    – Vlad
    May 2, 2023 at 14:25

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