ubuntu故障处理

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