[Bug 1028046] [NEW] choose-mirror doesn't recognize a valid precise mirror and instead searched for generic26

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I am trying to remotely install a system using cobbler and a precise mini i386 image with md5sum e4d16caf537be112f3dc9ba94e158cf7.  When I use that image to install a virtual machine, it works fine.  When I use the image on a physical machine, choose-mirror fails.  It runs:
wget -w http://us.archive.ubuntu.com/ubuntu/dists/precise/Release -O - | grep -E '^(Suite|Codename):'
which outputs:
Suite: precise
Codename: precise
After this, it tries to run:
wget -w http://us.archive.ubuntu.com/ubuntu/dists/generic26/Release -O - | grep -E '^(Suite|Codename):'
and fails because there is no generic26 directory.

On a virtual machine, the first download correctly sets the Suite and
Codename, and the install proceeds from there.  I have verified that the
md5sum of the output of the command on the physical and virtual machines
matches, but choose-mirror appears to be interpreting them differntly.
I can send along the preseeds I am using if that helps, but no preseed
changes I have so far discovered will make the physical machine work.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: debian-installer (not installed)
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Mon Jul 23 12:52:51 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MachineType: LENOVO 7052B9U
MemoryUsage:
 total       used       free     shared    buffers     cached
 Mem:      16390160   12642772    3747388          0     312604    5340636
 -/+ buffers/cache:    6989532    9400628
 Swap:     24195072      84152   24110920
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-26-generic root=UUID=ab0744e3-237d-4292-b260-a71e4a44443b ro quiet splash vt.handoff=7
SourcePackage: debian-installer
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/10/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 9HKT47AUS
dmi.board.vendor: LENOVO
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnLENOVO:bvr9HKT47AUS:bd01/10/2012:svnLENOVO:pn7052B9U:pvrThinkCentreM91p:rvnLENOVO:rn:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: 7052B9U
dmi.product.version: ThinkCentre M91p
dmi.sys.vendor: LENOVO

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


** Tags: apport-bug i386 precise qa-manual-testing qa-test-code
-- 
choose-mirror doesn't recognize a valid precise mirror and instead searched for generic26
https://bugs.launchpad.net/bugs/1028046
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