This actually comes from xorg's package hook. I guess there's no way
around having $DISPLAY set for some commands, but maybe it can be
quiesced a bit. Something like this, perhaps:
if os.environ.get('DISPLAY'):
# do commands which need $DISPLAY
# do commands which don't need $DISPLAY
** Package changed: apport (Ubuntu) => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Importance: Undecided => Low
** Changed in: xorg (Ubuntu)
Status: New => Triaged
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apport sometimes prints "Cannot open display" when run over ssh
https://bugs.launchpad.net/bugs/368282
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