https://mirrors.tuna.tsinghua.edu.cn/help/debian/
按照清华镜像站的说明修改文件内容后
apt-get update 报错
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ca-certificates is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'ca-certificates' has no installation candidate
root@DESKTOP-L79Q7C3:/home/syx# apt-get upate
E: Invalid operation upate
root@DESKTOP-L79Q7C3:/home/syx# apt-get update
Ign:1 https://mirrors.tuna.tsinghua.edu.cn/debian buster InRelease
Ign:2 https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates InRelease
Ign:3 https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports InRelease
Ign:4 https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates InRelease
Err:5 https://mirrors.tuna.tsinghua.edu.cn/debian buster Release
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]
Err:6 https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates Release
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]
Err:7 https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports Release
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]
Err:8 https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates Release
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]
Reading package lists... Done
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster/InRelease: No system certificates available. Try installing ca-certificates.
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster-updates/InRelease: No system certificates available. Try installing ca-certificates.
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster-backports/InRelease: No system certificates available. Try installing ca-certificates.
W: https://mirrors.tuna.tsinghua.edu.cn/debian-security/dists/buster/updates/InRelease: No system certificates available. Try installing ca-certificates.
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster/Release: No system certificates available. Try installing ca-certificates.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/debian buster Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster-updates/Release: No system certificates available. Try installing ca-certificates.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://mirrors.tuna.tsinghua.edu.cn/debian/dists/buster-backports/Release: No system certificates available. Try installing ca-certificates.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://mirrors.tuna.tsinghua.edu.cn/debian-security/dists/buster/updates/Release: No system certificates available. Try installing ca-certificates.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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