Comment 2 for bug 1500307

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Sean Davis (bluesabre) wrote :

This is likely because Synaptic is launched as a root user. If running synaptic from the commandline without sudo, the overlay scrollbars are not used.

Most likely, pkxec does not pass the DESKTOP_SESSION variable when launching an application, so we don't gain the benefits from /etc/X11/Xsession.d/56xubuntu-session