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更新期间出错

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更新期间出错 
W: Failed to fetch http: //ppa.launchpad.net/picaso/octave/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http: //ppa.launchpad.net/picaso/octave/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http: //ppa.launchpad.net/kilian/f.lux/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http: //ppa.launchpad.net/kilian/f.lux/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

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

我无法更新我的 ubuntu 14.04 并且我也遇到了一些 404 未找到的情况。

答案1

您添加了一些现在不再可访问的 PPA。

从软件源中停用 PPA。

例如：https://itsfoss.com/how-to-remove-or-delete-ppas-quick-tip/

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