在Ubuntu 16.04上执行命令sudo apt-get update之后出现以下错误 [英] Getting following error after the command sudo apt-get update on Ubuntu 16.04
问题描述
我对Linux命令一无所知，但我忍不住要问为什么在命令 sudo apt-get update 后显示此类错误:
I have no knowledge on Linux commands but I couldn't resist asking why such errors are showing after the command sudo apt-get update:
W:存储库' http://ppa.launchpad.net/bumblebee/stable/ubuntu xenial Release'没有发布文件.
W: The repository 'http://ppa.launchpad.net/bumblebee/stable/ubuntu xenial Release' does not have a Release file.
N:此类存储库中的数据无法通过身份验证，因此可能存在使用危险.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N:有关存储库创建和用户配置的详细信息，请参见apt-secure(8)联机帮助页.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W:存储库' http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu xenial Release'没有发布文件.
W: The repository 'http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu xenial Release' does not have a Release file.
N:此类存储库中的数据无法通过身份验证，因此可能存在使用危险.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N:有关存储库创建和用户配置的详细信息，请参见apt-secure(8)联机帮助页.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W:GPG错误: http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu xenial InRelease:由于公共密钥不可用，因此无法验证以下签名:NO_PUBKEY 799A5FD5D1C5997F
W: GPG error: http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 799A5FD5D1C5997F
W:存储库 'http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu xenial InRelease'未签名.
W: The repository 'http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu xenial InRelease' is not signed.
N:此类存储库中的数据无法通过身份验证，因此可能存在使用危险.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N:有关存储库创建和用户配置的详细信息，请参见apt-secure(8)联机帮助页.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E:无法获取 http://ppa.launchpad.net/bumblebee/stable/ubuntu/dists/xenial/main/binary-amd64/Packages 找不到404
E: Failed to fetch http://ppa.launchpad.net/bumblebee/stable/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E:某些索引文件下载失败.它们已被忽略，或改用旧的.
E: Some index files failed to download. They have been ignored, or old ones used instead.
我想知道发生以下错误的确切原因.一个解释对我很有帮助.
I would like to know what's exactly going on with the following errors. An explanation would be very helpful for me.
推荐答案
我按照以下步骤解决了该错误:
I solved this error following theses steps:
打开软件更新"应用程序；-在其他软件"选项卡中，取消标记所有选项；-在"Ubuntu软件"选项卡的下载自:"中，选择主服务器"选项.
Open the Software Updates application; - In "Other Software" tab unmark all options; - In Ubuntu Software tab, "Download from:" choose "Main server" option.
单击关闭"按钮，等待一分钟，直到ubuntu重新加载apt-get.
Click in "Close" button and wait a minute until ubuntu reload apt-get.
完成.
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