Does this also happen if you boot with upstart? (You can choose that
from the grub boot menu under "Advanced options").

Please also boot without "quiet splash $vt_handoff" -- does your
computer boot then? If so, it's a graphics/plymouth problem, if not this
should show where it's hanging.

/usr/share/doc/systemd/README.Debian explains how to run the debug shell
-- please do a boot with "systemd.debug-shell", and when it hangs switch
to it with Ctrl-Alt-F9 and save the output of "systemctl list-jobs" and
"journalctl" and attach them here. Thanks!

** Changed in: linux-flo (Ubuntu)
       Status: New => Incomplete

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Packages, which is subscribed to linux-flo in Ubuntu.
https://bugs.launchpad.net/bugs/1444070

Title:
  ubuntu 15.04 hangs at purple scren even with nomodeset

Status in linux-flo package in Ubuntu:
  Incomplete

Bug description:
  After installing Ubuntu 15.04 a few times, I'm always having the same
  problem, after booting the system several times, it always  hangs at
  plymouth. Before the problem takes place  I always notice some
  flickering on the screen after  plymouth The problem persists even
  with the nomodeset parameter or with recovery mode. I'm using a Acer
  Asipire V5-552G.

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