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It returns the following after $ sudo apt update or $ sudo apt-get update or etc...

Err:12 http://ppa.launchpad.net/mpstark/elementary-tweaks-daily/ubuntu focal Release 
  404  Not Found [IP: 91.189.95.85 80]\
Err:13 http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xanial Release\
  404  Not Found [IP: 91.189.95.85 80]\
Reading package lists... Done                      
E: The repository 'http://ppa.launchpad.net/mpstark/elementary-tweaks-daily/ubuntu focal Release' does not have a Release file.\
N: Updating from such a repository can't be done securely, and is therefore disabled by default.\
N: See apt-secure(8) manpage for repository creation and user configuration details.\
E: The repository 'http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xanial Release' does not have a Release file.\
N: Updating from such a repository can't be done securely, and is therefore disabled by default.\
N: See apt-secure(8) manpage for repository creation and user configuration details.
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  • That error message is telling you that the PPA that you have just added doesn't work. You still should be able to upgrade other apps.
    – Maccer
    Dec 13, 2021 at 17:19
  • @Maccer you are correct thank's. But how i can delete this and not seeing this every time i sudo apt update ? Dec 13, 2021 at 21:30

1 Answer 1

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To remove the two PPAs that are giving you errors, you will need to edit your sources.list file.

Here's how:

  1. Open Terminal (if it's not already open)
  2. Edit the sources.list file:
    sudo vi /etc/apt/sources.list
    
    Note: Feel free to use any text editor that you prefer. It does not need to be vi.
  3. Find the lines that refer to the URLs that are failing
  4. Add a # to the start of the line, or remove the line completely
  5. Update apt:
    sudo apt update 
    

You should not see the error(s) anymore.

If the URLs were not in sources.list, then they will be in a .list file somewhere inside the /etc/apt/sources.list.d directory. This really depends on how you added the PPAs to your system to begin with. However, the instructions above apply here as well. Open the file and comment out (or remove) the line.

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