Okay, on vivid, unity-greeter 15.04.2-0ubuntu1 re-introduces this bug.

I have a vivid image that was up-to-date as of Fri 5 Dec. In this
snapshot, with applying any updates, I can connect to protected WiFi
just fine.

However, today something landing from proposed re-introduced this bug,
and I noticed that unity-greeter was among the updates.

So I re-imaged and then upgraded only unity-greeter:

sudo apt-get update
sudo apt-get install unity-greeter

After a reboot, the password dialog wont show when I try to connect to
protected WiFi (same symptom as Utopic).

Interestingly enough, unity-greeter was one of the many things I tried
back-porting and it didn't fix this on Utopic, although now I can't
recall whether I did that back-port in isolation or whether there were
other backports I was testing at the same time.

Ah, also note that unity-greeter 15.04.2-0ubuntu1 does *not* break WiFi
on Intel GPU systems. This is still only a problem on systems with
Nvidia GPUs running the proprietary nvidia driver (might effect the
nouveau driver too, not sure either way on that one).

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https://bugs.launchpad.net/bugs/1388130

Title:
  Cannot connect to WiFi with Nvidia GPU using nvidia-331, SSD

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