Ubuntu报错E: Failed to fetch http://mirrors.cloud.aliyuncs.com解决方案
报错内容：在进行更新源和下载工具包时都会报错类似以下内容：
Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/nginx-common_1.18.0-6ubuntu14.4_all.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-http-geoip2_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-http-image-filter_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-http-xslt-filter_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-mail_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-stream_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/libnginx-mod-stream-geoip2_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/nginx-core_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu-ports/pool/main/n/nginx/nginx_1.18.0-6ubuntu14.4_arm64.deb Could not resolve ‘mirrors.cloud.aliyuncs.com’
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
寻求方法：
报错提示无法解析阿里云镜像链接，在网上找了很多解决方案，主要指出两个题目：
1.DNS解析题目
添加了以下DNS依然存在题目
https://img-blog.csdnimg.cn/direct/28adab5662d34e149a4d33d1065fb0fa.png
2.镜像源题目
修改成国内镜像源依然没有解决
终极解决
发现我的题目是DNS解析题目
阿里云的DNS是127.0.0.53，我添加的是127.0.0.253
修改后解决
1.打开并修改配置文件
sudo vi /etc/resolv.conf
2.在文件中添加阿里云DNS（按i进入编辑模式，添加后esc退出编辑模式，输入:wq生存并退出）
nameserver 127.0.0.53
https://img-blog.csdnimg.cn/direct/8ebb069cc3b84795830d439a7310c79f.png
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