Public bug reported:

Noticed that having a full disk encryption install with home directory
encryption requires entering the full disk encryption password twice:
once to unlock the disk, and again to unlock the 'swap'. Did not
configure a separate swap, this is the default swap provided.

System: Kernel: 3.19.0-15-generic x86_64 (64 bit gcc: 4.9.2)
Desktop: MATE 1.8.2 (Gtk 3.14.12-0ubuntu2)
Distro: Ubuntu 15.04 vivid
Graphics: Card: Advanced Micro Devices [AMD/ATI] Cedar [Radeon HD 
5000/6000/7350/8350 Series] bus-ID: 01:00.0
           Display Server: X.Org 1.17.1 drivers: ati,radeon (unloaded: 
fbdev,vesa) Resolution: 1920x1200@60.0hz
           GLX Renderer: Gallium 0.4 on AMD CEDAR GLX Version: 3.0 Mesa 10.5.2 
Direct Rendering: Yes

Confirmed it occurs on a physical machine (above hardware), also get the 
following bug:
https://bugs.launchpad.net/ubuntu/vivid/+source/linux/+bug/1359689

In Virtualbox 4.3.26, the preceding bug does not appear, but two
passwords must be entered (please see attached Virtualbox screenshot).
Also confirmed on Ubuntu with unity desktop.

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot.png"
   
https://bugs.launchpad.net/bugs/1448318/+attachment/4383460/+files/Screenshot.png

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https://bugs.launchpad.net/bugs/1448318

Title:
   15.04: Full disk encryption with home dir encryption: have to enter
  FDE password twice

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