root@TTS-ubuntu:/var# /etc/init.d/ssh start
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh start

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start ssh
ssh start/running, process 30752
root@TTS-ubuntu:/var# ps -aux | grep ssh
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
ttsadmin 20397  0.0  0.0      0     0 ?        Zs   Sep03   0:02 [ssh-agent] <defunct>
root     30784  0.0  0.0   8960   868 pts/1    S+   13:43   0:00 grep --color=auto ssh
root@TTS-ubuntu:/var#