Some comments:

 * The libudev0 → libudev1 migration is the least risky here. I can
prepare it today in the PPA for the handful of source packages which
need (trivial) adaptions for the dropped symbols, the other 20 or so
reverse dependencies are mere rebuilds.

 * In theory we can also update systemd to 198 without switching to
logind, i. e. just grant the first FFE. That would be really risk-free,
as systemd itself has only been in raring for a couple of days, and
nothing uses it yet. In that case I'd disable all udev library bits from
the source package. It still makes some sense as one would then have
current libraries available for experimentation, for the Ubuntu GNOME
PPA, etc., but of course for Ubuntu itself there would be no
recognizable change.

 * I can commit to dealing with fallout from the logind migration, I
have time for this. This part is really the most risky one as it
involves the most work, and may have regressions which are hard to spot
at first sight (e. g. yesterday I noticed my camera wasn't working in
Google+, I'll track that down today).

 * "ScottK> What happens if we do step one and stop?" As I said, we can
run CK and logind in parallel, so the impact would be to ship the two
packages (both are rather small), and having the additional (small)
runtime impact of two D-BUS services.

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https://bugs.launchpad.net/bugs/1153224

Title:
  [FFE] Move to logind for session tracking

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