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I am using Ubuntu 20.04.3 LTS. I've been facing an error for 2 days that is, I can't update or upgrade or perform package installs on my system because of the following errors:

Hit:1 http://packages.microsoft.com/repos/code stable InRelease                                                                   
Hit:2 http://archive.canonical.com/ubuntu focal InRelease                                                                         
Hit:3 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease                                                              
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease                                                                      
Ign:5 http://old-releases.ubuntu.com/ubuntu focal InRelease                                                                       
Ign:6 http://old-releases.ubuntu.com/ubuntu focal-updates InRelease                                                               
Hit:7 http://ppa.launchpad.net/kicad/kicad-5.1-releases/ubuntu focal InRelease                                                    
Hit:8 https://deb.opera.com/opera-stable stable InRelease                                                                         
Hit:9 https://packages.microsoft.com/repos/vscode stable InRelease                                                                
Ign:10 http://old-releases.ubuntu.com/ubuntu focal-backports InRelease                                                            
Ign:11 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease                                           
Ign:12 http://old-releases.ubuntu.com/ubuntu focal-security InRelease                                                      
Err:14 http://old-releases.ubuntu.com/ubuntu focal Release                                                                        
  404  Not Found [IP: 91.189.88.247 80]
Err:15 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release                                                    
  404  Not Found [IP: 91.189.95.85 80]
Err:16 http://old-releases.ubuntu.com/ubuntu focal-updates Release                                                           
  404  Not Found [IP: 91.189.88.247 80]
Hit:17 https://linux-clients.seafile.com/seafile-deb/focal stable InRelease                
Err:18 http://old-releases.ubuntu.com/ubuntu focal-backports Release 
  404  Not Found [IP: 91.189.88.247 80]
Err:19 http://old-releases.ubuntu.com/ubuntu focal-security Release  
  404  Not Found [IP: 91.189.88.247 80]
Ign:13 https://launchpad.net/~terry.guo/+archive/gcc-arm-embedded focal InRelease
Err:20 https://launchpad.net/~terry.guo/+archive/gcc-arm-embedded focal Release
  404  Not Found [IP: 91.189.89.222 443]
Reading package lists... Done

How can I solve this ?

Error404
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gogogo
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1 Answers1

101

Most of the repositories and PPAs in your sources.list are no longer available and are throwing errors. I'd recommend restoring the default repositories.

  1. First, restore the default repositories using these commands:

    mkdir ~/solution
cd ~/solution/

    cat << EOF > ~/solution/sources.list
deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
    

    deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
    

    deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
    

    deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
    

    deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner
EOF
    

    sudo sed -i "s/focal/$(lsb_release -c -s)/" ~/solution/sources.list
sudo rm /etc/apt/sources.list
sudo cp ~/solution/sources.list /etc/apt/sources.list

  2. Remove all the PPAs in your system:

    sudo mv /etc/apt/sources.list.d/* ~/solution

  3. Update the repositories:

    sudo apt update

All set!

Error404
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