Bug#665290: I think I understand; workaround

[Dominique Brazziel]

	Got it - the distro upgrade functionality should be there for those who
want it, but because it is not working properly in some instances, noise
about package management is generated in both .xsession-errors and
syslog.  

	Those, like myself, who do not want any _additional_ package management
updaters/helpers, etc. besides the daily apt updates may try
and disable the g-s-d updates plugin with:

   gsettings set org.gnome.settings-daemon.plugins.updates active false

or use dconf-editor to deactivate that plugin, followed by g-s-d restart
(i.e. logout/login).  I just did so on one machine and am monitoring to
see if the messages cease, so far so good.