choose-mirror doesn't recognize a valid precise mirror and instead searched for generic26

[Max Brustkern]

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

[Max Brustkern (nuclearbob)]

All of these files are from my system, and irrelevant to this bug.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Leonardo Borda (lborda)]

same behaviour in 12.04.1

[MCunha (mcunha71)]

Still happening, 14 months after this report. Impossible to make a minimal install with 12.04 using official CD (MD5 e4d16caf537be112f3dc9ba94e158cf7)