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Setting up openssh-server (1:5.3p1-3ubuntu7) ... Creating SSH2 RSA key; this may take some time ... Creating SSH2 DSA key; this may take some time ... start: Job failed to start

Can't initialize ssh, already tried reinstall.

SSH server is started manually via /etc/init.d/ssh start

netstat -nlp shows that no services are running at tcp port 22

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Could you clarify in your question if you have tried starting it manually, ie sudo /etc/init.d/ssh start, and if so, did it give a different error than when you installed? Also, maybe you would want to install nmap and run nmap to see if there is already a instance of ssh running and put the result in your question. – Azendale Jul 17 '11 at 20:21
i tried to run it manually, and got the same thing – Frielspak Jul 17 '11 at 23:14
Try to start once again the ssh daemon manually and then open /var/log/auth and check at the bottom of the file what the logs show... – Pavlos G. Aug 22 '11 at 10:59

Not sure that my solution is right. But if you just want to start your SSH server and then solve your problem later, here is my fast solution:

start-stop-daemon --start --pidfile /var/run/ --exec /usr/sbin/sshd -- -p 22

if then you will see error:

Missing privilege separation directory: /var/run/sshd

then just create that missing directory, and try above start-stop-daemon command again:

mkdir /var/run/sshd
chmod 0755 /var/run/sshd

that helped me to start my sshd daemon.

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This only fixes it for the current session. After a reboot that directory will be gone. – Malfist Nov 18 '13 at 4:28

There seem to be 3 issues resulting in this behavior (for my system Ubuntu 14.04LTS):

1- ssh unknown job occurs when you try to use 'service ssh start' from a 'su' session. Solution is to use sudo service start from a logged in user that can 'sudo'

2- The existing init.d/ssh script is exiting quietly without actually starting sshd when ssh is on upstart

3- The main reason ssh does not start is because on Ubuntu 14.04 there is an empty file /etc/ssh/sshd_host_not_to_run which indicates that sshd should not run. Just delete that file if you want sshd to run.

So overall solution is: Use sudo service ssh start after deleting /etc/ssh/sshd_host_not_to_run

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