ubuntu partman-lvm: No volume groups found, ubiquity: umount: /tmp/tmp.ep6sXEyZUA: not mounted

seems a dup of bug 1065034 fixed
Hallo
Ubuntu amd64 desktop 20121015.2 in Vbox, not reproduced in a real hardware attempt.
testing an installation from live session , networking and french localization in a Vbox disk not clean (already used for another installation).
The installer hang at the step prepare.
the syslog report>
 18:20:32 ubuntu partman-lvm:
Oct 16 18:20:32 ubuntu partman-lvm: No volume groups found
Oct 16 18:20:32 ubuntu partman-lvm:
Oct 16 18:20:33 ubuntu ubiquity: umount: /tmp/tmp.ep6sXEyZUA: not mounted
Oct 16 18:20:33 ubuntu ubiquity:
Oct 16 18:20:33 ubuntu ubiquity: umount: /tmp/tmp.HH8x6T14rl: not mounted
Oct 16 18:20:33 ubuntu ubiquity:

Sames modality of installation, but run in a real hardware works as expected.

Thanks
Fabio

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.12.12 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.328
Date: Tue Oct 16 19:12:40 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121015.2)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)