apt命令报证书错误的解决方法——- Certificate verification failed: The certificate is NOT trusted.
一、错误描述
用apt-get install命令安装软件或apt-get update命令更新时报错，错误如下：
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 101.6.15.130 443]
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/universe/t/traceroute/traceroute_2.1.0-2_amd64.deb Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 101.6.15.130 443]
E: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing?
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二、解决方式
1.更改源文件，将所有的https改成http：
sudo vi /etc/apt/sources.list
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我用的是清华的镜像，更改过后如下：
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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2.更新源
sudo apt-get update
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3.安装/更新证书ca-certificates
sudo apt-get install –reinstall ca-certificates
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4.参照步骤一将镜像源文件改回https
改完后/etc/apt/sources.list 文件内容如下：
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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5.再次更新源
sudo apt-get update
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6.至此可以正常安装软件了。OK！
sudo apt-get install xxxxx
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解决Ubuntu apt 错误：Certificate verification failed: The certificate is NOT trusted
有问题或资源连接有缺失的可以私信公众号新潮看世界获取
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开始我以为是apt 源的问题，接连换了清华，阿里，utsc等源，都不行。但是说我认证错误，之前用都没问题，怎么突然就错了呢？但是sudo date -s “20230222.143900” ,提示无效，不是命令错误，而是无效，意思就是无法设置。然后就想到了一个问题，系统日期可能过时了，意思就是系统日期太旧了，现在是2023年，估计设置到了之前的某个年份。某一天，突然apt install下载不了软件包了。想起还有一个ntp的网络时钟同步功能关闭了，好了，意思就是设置回来时间就好了。
sdo-check:semantify.it的sdo-check工具的开源版本
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原文链接：https://blog.csdn.net/Chaowanq/article/details/121559709