Create privilege separation dir required by Ubuntu (apparently).

Dockerfile

@@ -20,11 +20,13 @@ RUN mv /tmp/parallel /usr/bin/
 COPY get-pdf.sh /
 COPY mod_caption.rb /
 COPY run-server.sh /
+COPY create_sshd_privsep_dir.sh /
 
 RUN ln -s /bin/bash /usr/bin/bash
 
 RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
 RUN sed -ri 's/#?LogLevel INFO/LogLevel VERBOSE/'                     /etc/ssh/sshd_config
+RUN bash -c -l /create_sshd_privsep_dir.sh
 
 ## install RVM, Ruby, and Bundler
 #RUN gpg2  --keyserver hkp://keys.gnupg.net  --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

create_sshd_privsep_dir.sh

+#! /bin/bash
+
+# Create the PrivSep empty dir if necessary
+if [ ! -d /var/run/sshd ]; then
+   mkdir /var/run/sshd
+   chmod 0755 /var/run/sshd
+fi
+
+