"[FAIL ]startpar: service(s) returned failure: dbus … failed!"
The message shows up when boot finished. And I can still login to the Rpi.
What does this message mean and how to fix it?
Well, not surprisingly this means that the
dbus service failed to start.
Given that you can log in to the Pi, I'd try:
sudo service dbus start and see whether you can start it manually, then use
dmesg and report what the last few lines say. However this may not work for you because I use sysv
init (the default for older versions of Raspian) and I do not know that the default
systemd for the current "Jessie" version at the time of writing responds to the same commands.