Looks like the culprit is the python script that update-notifier launches to discover if there are updates available:
$ /usr/lib/update-notifier/apt-check -p
Reading package lists... Done
Building dependency tree
Reading state information... Done
xscreensaver
bse-alsa
xli
Looking further, it seems that depcache.MarkedInstall returns true for
these packages. But I have never asked anything to install them, and I
don't know where apt would even keep track of this information.
--
Sam Morris
http://robots.org.uk/
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