Enable SSH login on Ubuntu

I followed DeepSeek’s instruction to enable SSH login on Ubuntu:

• Enable SSH login on Ubuntu

There are several notes about the SSH daemon configuration on Ubuntu. Firstly, better to disable the ufw firewall for testing environment. In addition, better to disable the gcr-ssh-agent like this:

• What is gcr-ssh-agent?

And if I need to debug the sshd, here is the reference:

• How to Run sshd in Debug Mode

Most importantly, the configurations are required in /etc/ssh/sshd_config:

PubkeyAuthentication yes
AllowUsers anan

Some more troubleshooting info:

• What Does “receive packet: type 51” Mean in SSH?
• How to Fix “Missing Privilege Separation Directory: /run/sshd” Error in SSH
• Disable SELinux On Ubuntu

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