dokku error

Processing triggers for ureadahead ...
Setting up unattended-upgrades (0.76ubuntu1) ...
Setting up python-pycurl (7.19.0-4ubuntu3) ...
Setting up python-software-properties (0.82.7.6) ...
Cloning into 'dokku'...
remote: Counting objects: 1712, done.
remote: Compressing objects: 100% (1205/1205), done.
remote: Total 1712 (delta 793), reused 1328 (delta 451)
Receiving objects: 100% (1712/1712), 301.99 KiB | 109 KiB/s, done.
Resolving deltas: 100% (793/793), done.
wget -qO /usr/local/bin/sshcommand https://raw.github.com/progrium/sshcommand/master/sshcommand
chmod +x /usr/local/bin/sshcommand
sshcommand create dokku /usr/local/bin/dokku
make: *** [sshcommand] Error 2