I have experienced this also, on two different machines with recent
installs on trying to launch gnome-session or xfce4-session
an older machine that hasn't been updated in a while runs just fine.
I found that switching from vnc4server back to tightvncserver ("fixes"
isn't the right word) removes the problem for me.
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vnc4server does not start Desktop environment after security update
https://launchpad.net/bugs/78282
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