Detailed explanation of the service problem reported by Ubuntu 20.04 using Xshell through SSH connection

1. I recently installed a new version of Ubuntu. After modifying the /etc/ssh/sshd_config configuration file, an error message will be displayed when connecting with Xshell. The error message is as follows:

Second, the solution is to add the following content to the last line of the /etc/ssh/sshd_config configuration file:

3. Then restart the ssh service:

4. Change the foreign yum source to the domestic yum source

First back up the original /etc/apt/sources.list configuration file:

Find the Ali source on the Internet, delete the original content in the /etc/apt/sources.list configuration file, and paste the Ali source

Finally, update the source file:

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