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当我尝试从 Ubuntu 14.04 升级到 16.04 时，出现了“更新过程中出错，更新过程中出现问题。”的错误信息

tag-icon • tag-icon 14.04 16.04 upgrade updates
当我尝试从 Ubuntu 14.04 升级到 16.04 时，出现了“更新过程中出错，更新过程中出现问题。”的错误信息

我正在尝试从 Ubuntu 14.04 升级到 Ubuntu 16.04，但在升级过程中，系统显示

Error during update

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.

W:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/stable/main/binary-amd64/Packages  404  Not Found 
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/stable/main/binary-i386/Packages  404  Not Found 
, E:Some index files failed to download. They have been ignored, or old ones used instead.

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