使用 sudo apt-get update 命令时出现 Certificate verification failed: The certificate is NOT trusted.

命令：

sudo apt-get update

问题：Certificate verification failed: The certificate is NOT trusted. Try installing ca-certificates.

忽略:1 https://professional-store-packages.chinauos.com/appstore eagle InRelease
错误:3 https://professional-store-packages.chinauos.com/appstore eagle Release
  Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown.  Could not handshake: Error in the certificate verification. [IP: 8.136.212.49 443]
忽略:4 https://professional-packages.chinauos.com/printer eagle InRelease
忽略:2 https://professional-packages.chinauos.com/desktop-professional eagle InRelease
错误:6 https://professional-packages.chinauos.com/printer eagle Release
  Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown.  Could not handshake: Error in the certificate verification. [IP: 8.136.212.49 443]
错误:5 https://professional-packages.chinauos.com/desktop-professional eagle Release
  Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown.  Could not handshake: Error in the certificate verification. [IP: 8.136.212.49 443]
正在读取软件包列表... 完成
W: https://professional-store-packages.chinauos.com/appstore/dists/eagle/InRelease: No system certificates available. Try installing ca-certificates.
W: https://professional-store-packages.chinauos.com/appstore/dists/eagle/Release: No system certificates available. Try installing ca-certificates.
E: 仓库 “https://professional-store-packages.chinauos.com/appstore eagle Release” 不再含有 Release 文件。
N: 无法安全地用该源进行更新，所以默认禁用该源。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: https://professional-packages.chinauos.com/printer/dists/eagle/InRelease: No system certificates available. Try installing ca-certificates.
W: http://professional-packages.chinauos.com/desktop-professional/dists/eagle/InRelease: No system certificates available. Try installing ca-certificates.
W: https://professional-packages.chinauos.com/printer/dists/eagle/Release: No system certificates available. Try installing ca-certificates.
E: 仓库 “https://professional-packages.chinauos.com/printer eagle Release” 不再含有 Release 文件。
N: 无法安全地用该源进行更新，所以默认禁用该源。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: http://professional-packages.chinauos.com/desktop-professional/dists/eagle/Release: No system certificates available. Try installing ca-certificates.
E: 仓库 “http://professional-packages.chinauos.com/desktop-professional eagle Release” 不再含有 Release 文件。
N: 无法安全地用该源进行更新，所以默认禁用该源。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。

解决：

1. 从 Ubuntu 存储库手动下载包ca-certificates。你可以使用 wget 下载它

wget --no-check-certificate http://security.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20230311ubuntu0.20.04.1_all.deb

2. 运行

dpkg -r --force-depends ca-certificates

以删除没有内容的旧包和最终文件。

3. 运行

dpkg -i ca-certificates/ca-certificates_20230311ubuntu0.20.04.1_all.deb

以安装软件包。

这应该使你在证书方面或多或少地处于一个干净的状态。

未来读者注意：不要使用wget上面的命令；从 packages.ubuntu.com查找适用于你的 Ubuntu 版本的最新软件包。这些事情确实发生了变化。

参考：https://www.nuomiphp.com/a/serverfault/zh/6222ca083089ac36901903e9.html