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[god <1427654@xxxxxxxxxxxxxxxxxx>]

Is there some detailed notes on why upstart is still used for user
sessions instead of systemd? Is it just lack of time or there are some
technical reasons not to switch to systemd here as well?

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https://bugs.launchpad.net/bugs/1427654

Title:
  FFE: switch system init to systemd [not touch] in 15.04

Status in init-system-helpers package in Ubuntu:
  Fix Released
Status in ubuntu-meta package in Ubuntu:
  Fix Released
Status in init-system-helpers source package in Vivid:
  Fix Released
Status in ubuntu-meta source package in Vivid:
  Fix Released

Bug description:
  As per https://blueprints.launchpad.net/ubuntu/+spec/core-1411
  -systemd-migration we aimed for switching the system (not session)
  init from upstart to systemd this cycle. As this was by and large a
  1.2 man show, this took a little longer. One of the remaining blockers
  for switching the default was to fix NFS (bug 1312976) which is now
  ready to be uploaded. There is also juju (bug 1409639, landed upstream
  now) and maas (bug 1423613, scheduled), but for those we can work
  around missing systemd support by installing upstart on instances.

  We are a few days past feature freeze now, bug Steve and I discussed
  last week, and we still want to aim for switching the default in
  vivid. To be clear, this will affect Ubuntu desktop/server/cloud and
  the flavours like Kubuntu, but *NOT* ubuntu-touch. Migration to
  systemd is blocked on touch (too old kernels, some unported jobs), and
  was not scheduled for vivid. For that we need to ensure to keep
  upstart on Touch (there is a work item on the spec).

  I know from at least Kubuntu and Ubuntu GNOME that they are pushing
  for switching to systemd. We should get an ack from the others
  (Lubuntu/Xubuntu/MATE) before doing the switch; but quite a lot of
  vivid users are running systemd already, and I believe we shook out
  the worst bugs now.

  So if/once the release team generally agrees, these are the things
  which need to  happen before switching:

    * Signoff/test from remaining flavours (MATE, Xubuntu, Lubuntu) - DONE
    * Land NFS (bug 1312976) - DONE
    * Ensure Touch keeps upstart (bug 1428026) - DONE

  Operationally, the switch is merely to change s/upstart/systemd-sysv/
  in the seeds, i. e. flip the dependency in ubuntu-minimal. I did that
  in https://launchpad.net/~pitti/+archive/ubuntu/systemd, fixed
  ureadahead, and verified that upgrades from trusty and utopic cleanly
  upgrade to vivid+PPA with removing upstart and installing systemd-
  sysv.

  Around that time I will send a mail to ubuntu-devel-announce@ to warn
  about the impending switch, and give some pointers how to boot with
  upstart (from grub menu or reinstalling upstart), how to debug
  boot/shutdown issues, etc.

  Contingency plan: This will trigger wider testing, and most certainly
  uncover more integration issues. I'll try to keep up with them, but if
  we get to a point where we find that there are too many/too serious
  regressions, we can flip the seed back to upstart and get back to the
  situation today.

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