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1、VMware虚拟机安装Ubuntu后，在系统终端挂载光驱后，不能解压tar包？
原因分析：光驱写保护。
解决方法： 解除光驱保护即可。
2、Ubuntu系统终端上可使用密码切换至root账户，但通过ssh以root远程登录系统失败？
The remote system refused the connection.
原因分析：sshd服务未允许root登录，建议不开启；
解决方法：修改sshd配置并重启即可。
sed -i 's@#PermitRootLogin prohibit-password@PermitRootLogin yes@g' /etc/ssh/sshd_config && service ssh restart && service ssh status
3、Ubuntu软件源不能更新软件包？
root@zcl-test1:~# apt-get update
Ign:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan InRelease
Ign:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-updates InRelease
Ign:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-backports InRelease
Ign:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security InRelease
Ign:5 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed InRelease
Err:6 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan Release
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]
Err:7 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-updates Release
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]
Err:8 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-backports Release
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]
Err:9 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security Release
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]
Err:10 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed Release
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]
Reading package lists... Done
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan 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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security 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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed 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.
原因分析：https证书过期；
解决方法：更换为http协议访问即可。
cat <<eof> /etc/apt/sources.list
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
# deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
# deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
# deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
eof
apt-get update
来源：https://www.cnblogs.com/chalon/p/15261042.html |
发表于 2021-9-13 11:49:00
