本文借鉴自https://blog.csdn.net/weixin_43976343/article/details/86326215
遇到错误
Err:1 http://mirrors.aliyun.com/ubuntu xenial InRelease
Could not resolve ‘mirrors.aliyun.com’
Err:2 http://archive.ubuntukylin.com:10006/ubuntukylin xenial InRelease
Could not resolve ‘archive.ubuntukylin.com’
Err:3 http://mirrors.aliyun.com/ubuntu xenial-security InRelease
Could not resolve ‘mirrors.aliyun.com’
Err:4 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease
Could not resolve ‘mirrors.aliyun.com’
Err:5 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease
Could not resolve ‘mirrors.aliyun.com’
Err:6 http://mirrors.aliyun.com/ubuntu xenial-proposed InRelease
Could not resolve ‘mirrors.aliyun.com’
Err:7 http://old-releases.ubuntu.com/ubuntu jaunty InRelease
Could not resolve ‘old-releases.ubuntu.com’
Reading package lists… Done
W: Failed to fetch http://old-releases.ubuntu.com/ubuntu/dists/jaunty/InRelease Could not resolve ‘old-releases.ubuntu.com’
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial/InRelease Could not resolve ‘mirrors.aliyun.com’
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial-security/InRelease Could not resolve ‘mirrors.aliyun.com’
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial-updates/InRelease Could not resolve ‘mirrors.aliyun.com’
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial-backports/InRelease Could not resolve ‘mirrors.aliyun.com’
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial-proposed/InRelease Could not resolve ‘mirrors.aliyun.com’
W: Failed to fetch http://archive.ubuntukylin.com:10006/ubuntukylin/dists/xenial/InRelease Could not resolve ‘archive.ubuntukylin.com’
W: Some index files failed to download. They have been ignored, or old ones used instead.
显示为无法解析地址：
检查/etc/resolv.conf，发现之前修改的nameserver总是会被修改为127.0.0.53，无论是改成啥，过段时间，总会变回来。
查看/etc/resolv.conf这个文件
This file is managed by man:systemd-resolved(8). Do not edit.
这说明这个文件是被systemd-resolved这个服务托管的
因此打开文件
sudo vi /etc/systemd/resolved.conf
将阿里(223...)和清华(8...)的域名加上，保存退出
[Resolve]
DNS=223.5.5.5 223.6.6.6 8.8.8.8 8.8.4.4
#FallbackDNS=
#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no
#Cache=yes
#DNSStubListener=yes
然后重启
sudo systemctl restart systemd-resolved.service
再将用阿里的镜像地址替换ubuntu的地址，打开list文件
sudo gedit /etc/apt/sources.list
原来文件里的ubuntu网址全删掉，将下面的复制进去。
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
然后刷新一下。
就可以update了。
，，，就这个操作我居然找了一个晚上加一个上午，贼气
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