Failed to start OpenBSD Secure Shell server

root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# sshd -T
Missing privilege separation directory: /run/sshd

Missing privilege separation directory: /run/sshd
root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# mkdir -p /run/sshd
root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# sshd -T
port 22
addressfamily any
listenaddress [::]:22
listenaddress 0.0.0.0:22

root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# mkdir /run/sshd
root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# /usr/bin/sshd
bash: /usr/bin/sshd: No such file or directory
root@ubuntu:/data1/root/ryu/SDN-IP-Ryu# /usr/sbin/sshd 
root@ubuntu:/data1/root/ryu/SDN-IP-Ryu#