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W: GPG 错误：http://ppa.launchpad.net precise Release: 由于没有公钥，无法验证下列签名： NO_PUBKEY C2518248EEA14886
W: 无法下载 http://ppa.launchpad.net/ailurus/ppa/ub ... ce/Sources 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ailurus/ppa/ub ... 4/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ailurus/ppa/ub ... 6/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... ce/Sources 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... 4/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... 6/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... ce/Sources 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... 4/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/ossug-hychen/p ... 6/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/shawn-p-huang/ ... ce/Sources 404 Not Found

W: 无法下载 http://ppa.launchpad.net/shawn-p-huang/ ... 4/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/shawn-p-huang/ ... 6/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/tualatrix/ppa/ ... ce/Sources 404 Not Found

W: 无法下载 http://ppa.launchpad.net/tualatrix/ppa/ ... 4/Packages 404 Not Found

W: 无法下载 http://ppa.launchpad.net/tualatrix/ppa/ ... 6/Packages 404 Not Found

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

qy117121 写了：ppa源，禁用就是了

月下叹逍遥 写了：ubuntu-tweak清理，不知道有没有12.04版的。。。