docker配置倉儲庫時出錯：無法安全地用該源進行更新，所以默認禁用該源

在Ubuntu上安裝docker，配置倉儲庫時第一次使用了阿里去的鏡像，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"

 結果出現了以下錯誤：

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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                                                                                                                                        獲取:3 http: //security .ubuntu.com /ubuntu bionic-security InRelease [83.2 kB]                                                                                                                                     獲取:4 http: //cn .archive.ubuntu.com /ubuntu bionic-updates InRelease [88.7 kB]                                                                                                                                     命中:5 https: //dl .yarnpkg.com /debian stable InRelease                                                                                                                                                             錯誤: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                                                                                                                                                正在讀取軟件包列表... 完成                                                                                                                                                                                        E: 倉庫 “http: //ppa .launchpad.net /chris-lea/node .js /ubuntu bionic Release” 沒有 Release 文件。 N: 無法安全地用該源進行更新，所以默認禁用該源。 N: 參見 apt-secure(8) 手冊以了解倉庫創建和用戶配置方面的細節。

顯示是連接 到download.docker.com時失敗，無法下載，試了N次，始終不行，換了各種鏡像，都 不行，坑的不要不要的，最后終於注意到一句話：

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

 配合上面 的錯誤 6，我決定搜一下這個問題，最終找到 了這個鏈接

按照這個哥們 的說法，這些舊的什么 鬼ppa會導致 很多問題，要把這些東西刪掉，先找到這些無法使用的，使用如下 命令：

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1	sudo apt-get update | grep "Failed"

 回車執行輸出如下：

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

 於是按照上面哥們 說的，執行下面命令：

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

 回車卸載。卸載 后再次執行阿里去的倉儲庫，成功！

感謝上面的哥們！