[Bug 1408925] [NEW] Netboot installation of Ubuntu 15.04 fails, "The installer failed to download a file from the mirror."

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Problem Description 
=====================
Cannot perform a netboot installation of Ubuntu 15.04. Shortly after choosing United Kingdom for archive mirror country, then selecting ports.ubuntu.com, and entering our proxy (http://10.33.11.31:3128), the following error message is displayed:

Download installer components
The installer failed to download a file from the mirror. This may be 
a problem with your network, or with the mirror. You can choose to
retry the download, select a different mirror, or cancel and choose
another installation method.     

Downloading a file failed:
Retry                                     
Change mirror
Cancel   

---uname output---
N/A (unable to install)
 
Machine Type = 8247-22L (PowerKVM guest) 

Steps to Reproduce
=============================
1. ssh to bamkvm (see system access info below)
2. Run `virsh start --console bu14g1`
3. Choose the "Install Ubuntu 15.04" option
4. Proceed through the installer, enter http://10.33.11.31:3128 as the proxy
5. Observe error
 
Install method: Netboot via DHCP
 
Install disk info: QEMU-img raw file stored on a Solstice array
 
Install ISO Information: vivid-server-ppc64el.iso

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-120120 severity-critical targetmilestone-inin---
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Netboot installation of Ubuntu 15.04 fails, "The installer failed to download a file from the mirror."
https://bugs.launchpad.net/bugs/1408925
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