[PD] Application initialization failed: no display name and no $DISPLAY environment variable

[Alexandros Drymonitis]

Just installed Pd in my Udoo quad with sudo apt-get install puredata and
all the necessary files appear to be where they should but when I type
/usr/bin/puredata (or pd) I get the above message and then 'watchdog:
signaling pd...' without anything else happening.
I'm logging in udoo with ssh. What do I need to do?
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