Как исправить ошибку 404 при установке обновлений? [дубликат]

Возможный дубликат:
Как я могу исправить ошибку 404 с помощью PPA?

Я не могу установить любое программное обеспечение в моей системе Ubuntu 12.04 LTS.

Вот результат sudo apt-get update

Ign http://dl.google.com stable InRelease
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Hit http://dl.google.com stable Release.gpg                                    
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Hit http://dl.google.com stable Release.gpg                                    
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Hit http://security.ubuntu.com precise-security/main i386 Packages             
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Hit http://security.ubuntu.com precise-security/multiverse i386 Packages       
Hit http://security.ubuntu.com precise-security/main TranslationIndex          
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Hit http://ppa.launchpad.net precise/main Sources                              
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Hit http://archive.ubuntu.com precise-updates/main TranslationIndex            
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Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex        
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Err http://ppa.launchpad.net precise/main Sources
  404  Not Found
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  404  Not Found
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W: Failed to fetch http://ppa.launchpad.net/lucid-bleed/ppa/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/lucid-bleed/ppa/ubuntu/dists/precise/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/lucid-bleed/ppa/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.