docker配置仓储库时出错：无法安全地用该源进行更新，所以默认禁用该源

在Ubuntu上安装docker，配置仓储库时第一次使用了阿里去的镜像，如下

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1	sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

 结果出现了以下错误：

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misland@misland-virtual-machine: /etc/apt $ sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable" 命中:1 http: //cn .archive.ubuntu.com /ubuntu bionic InRelease                                                                                                                                                      忽略:2 http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic InRelease                                                                                                                                        获取:3 http: //security .ubuntu.com /ubuntu bionic-security InRelease [83.2 kB]                                                                                                                                     获取:4 http: //cn .archive.ubuntu.com /ubuntu bionic-updates InRelease [88.7 kB]                                                                                                                                     命中:5 https: //dl .yarnpkg.com /debian stable InRelease                                                                                                                                                             错误:6 http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic Release                                                                                                                                              404  Not Found [IP: 91.189.95.83 80] 命中:7 http: //mirrors .aliyun.com /docker-ce/linux/ubuntu bionic InRelease                                                                                                                                          命中:8 http: //packages .microsoft.com /repos/vscode stable InRelease                                                                                                                                                正在读取软件包列表... 完成                                                                                                                                                                                        E: 仓库 “http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic Release” 没有 Release 文件。 N: 无法安全地用该源进行更新，所以默认禁用该源。 N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。

显示是连接 到download.docker.com时失败，无法下载，试了N次，始终不行，换了各种镜像，都 不行，坑的不要不要的，最后终于注意到一句话：

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1	E: 仓库 “http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic Release” 没有 Release 文件

 配合上面 的错误 6，我决定搜一下这个问题，最终找到 了这个链接

按照这个哥们 的说法，这些旧的什么 鬼ppa会导致 很多问题，要把这些东西删掉，先找到这些无法使用的，使用如下 命令：

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1	sudo apt-get update | grep "Failed"

 回车执行输出如下：

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1 2	sudo apt-get update | grep "Failed" E: 仓库 “http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic Release” 没有 Release 文件。

 于是按照上面哥们 说的，执行下面命令：

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1	sudo add-apt-repository --remove ppa:chris-lea /node .js

 回车卸载。卸载 后再次执行阿里去的仓储库，成功！

感谢上面的哥们！