apt安装包时报错：Certificate verification failed: The certificate is NOT trusted._no system certificates available. try installing c-优快云博客

本文链接：https://blog.youkuaiyun.com/gbstack08/article/details/115967622

在使用apt安装包时遇到证书验证失败的问题，错误提示为'Certificate verification failed: The certificate is NOT trusted.'。尝试安装和更新ca-certificates未成功。通过在源配置文件中添加[trusted=yes]并未解决问题。最终通过临时关闭证书验证（Acquire { https::Verify-Peer false }）解决了问题，但此方法不推荐。检查/etc/ca-certificates确认系统包含了DST_Root_CA_X3.crt。

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忽略:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu groovy-updates/universe amd64 apt-transport-https all 2.1.10ubuntu0.3
错误:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu groovy-updates/universe amd64 apt-transport-https all 2.1.10ubuntu0.3
Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. Could not handshake: Error in the certificate verification. [IP: 101.6.8.193 443]
W: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/universe/a/apt/apt-transport-https_2.1.10ubuntu0.3_all.deb: No system certificates available. Try installing ca-certificates.
W: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/universe/a/apt/apt-transport-https_2.1.10ubuntu0.3_all.deb: No system certificates available. Try installing ca-certificates.
E: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/universe/a/apt/apt-transport-https_2.1.10ubuntu0.3_all.deb Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. Could not handshake: Error in the certificate verification. [IP: 101.6.8.193 443]
E: 有几个软件包无法下载，要不运行 apt-get update 或者加上 --fix-missing 的选项再试试？

之前将源改为了清华的源，清华源之前的源使用的是http，清华源使用的是https

尝试了apt install ca-certificates和apt upgrade ca-certificates都没有效果（需要切换到原始源尝试，否则因为清华源证书错误无法运行）

尝试了添加[trusted=yes]到源配置文件中，也无效

deb [trusted=yes] https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy main restricted universe multiverse
deb [trusted=yes] https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-updates main restricted universe multiverse
deb [trusted=yes] https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-backports main restri