Job for sshd.service failed because of unavailable resources or another system error.

This error message indicates that the sshd service failed to start due to either unavailable resources or another system error.

First, try checking the system logs to see if there are any more specific error messages that can help identify the issue. You can check the logs using the command `journalctl -xe`.

If there are no specific error messages in the logs, then it's possible that there is a resource issue, such as insufficient memory or disk space. You can check the system resource usage using the `top` or `htop` command.

If the resource usage looks normal, try restarting the sshd service using the command `systemctl restart sshd`. If the service still fails to start, you may need to reinstall or repair the sshd package on your system.