Comment 16 for bug 62163

 dbus (1.0.2-5ubuntu1) gutsy; urgency=low
 .
   * Merge with Debian unstable; remaining Ubuntu changes:
     - debian/patches/80-dbus-change-at-console-policy.patch: Make at_console
       policy work with libpam-foreground.
     - debian/patches/81-session.conf-timeout.patch: Raise the service startup
       timeout from 25 to 60 seconds. It may be too short on the live CD with
       slow machines.
     - debian/rules: Start dbus at runlevel priority 12, so that it comes
       before gdm. This eliminates the race condition of starting the X session
       before hal is running. Also use 'multiuser' mode of update-rc.d.
     - debian/dbus.postinst: Migrate rc?.d symlinks from 20 to 12 on upgrades
       to this version. This needs to be kept until the next Ubuntu LTS.
     - debian/dbus.{postinst,prerm}: Reverted Debian's change to always restart
       dbus on upgrades.
   * debian/control: Drop dbus dependency to dbus-x11, since we crave to get
     rid of that Xsession.d script. (LP: #62163)
   * debian/dbus.preinst: Improve rm_conffile() to get the unmodified md5sum
     from dpkg instead of hardcoding it, and remove unchanged
     /etc/X11/Xsession.d/75dbus_dbus-launch on upgrade.

Now, systems which need the dbus and do not restart it by themselves need a dependency to dbus-x11.