Ubuntu and Kubuntu 26.04 SSH setup for older virtual machine clients

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A user with several old and new virtual machines needs each VM to connect via SSH to the host. They install the openssh-server package on Ubuntu or Kubuntu 26.04 to enable this. To allow connections from older clients, they add a configuration file under sshd_config.d. The file re-enables legacy options such as CBC ciphers, diffie-hellman-group1-sha1 key exchange, and ssh-rsa host keys. The author suggests checking the sshd service status log when a client login fails and consulting the sshd_config manual to find which options need values.

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