It seems that the gnome-settings-daemon 'updates' plugin
is responsible for many of the packagekit updates, as
'gsd-updates-refresh' indicates:
#define PERIODIC_CHECK_TIME 60*60 /* poke PackageKit every hour */
I run rsyslog which receives messages from another machine which runs 2
desktop sessions (one native, one VNC) and do the updates faithfully in
addition to some ad-hoc command line apt(itude) work, so didn't notice
the one hour interval when I initially perused the logs. Upon initial
viewing without knowing about the g-s-d updates plugin it just seemed
like a storm of activations with no discernible source.
If the one hour trigger from each of the g-s-d processes is sifted out
of the messages, what is left might be attributed to dpkg and apt-get
update post-invoke calls from '/etc/apt/apt.conf.d/20packagekit'.
OK to close this, and thank you for the hint about g-s-d and for your
fine work with Debian.
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