So the plot sickens.. I can start Xfce4 with startxfce4 from a tty, and
synaptic works. If I use wdm to start xfce4, it does not.  The DISPLAY
variable for both is :0.0

It turns out that WDM does not set XAUTHORITY. If you export it like so in the 
terminal window:
export XAUTHORITY=$HOME/.Xauthority

it runs.  The bug is with WDM.

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https://bugs.launchpad.net/bugs/829099

Title:
  synaptic-pkexec fails: cannot open display 0

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