Comment 18 for bug 221657

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Malte (malte-m) wrote :

Little minutes of research give already some insight.

/usr/share/xsessions/xfce4.desktop contains a line saying

  Exec: startxfce4

A quick look at .xsession-errors reveals that this command tries to start an X server even though there is already an X server running gdm. Looks like startxfce4 is the wrong command to start a session.