update warnings on kernel3.5.0-5 installation on usb drive - error code 2

I am running Quantal from a usb drive, prepared with usb-creator(latest on Ubuntu12.04-proposed).

The latest updates I give to the usb Quantal system gives follwing terminal output(sudo apt-get dist-upgrade):

linux-image-3.5.0-5-generic (3.5.0-5.5) wird eingerichtet ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
The link /vmlinuz is a dangling linkto /boot/vmlinuz-3.5.0-4-generic
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.5.0-5-generic /boot/vmlinuz-3.5.0-5-generic
update-initramfs: Generating /boot/initrd.img-3.5.0-5-generic
cryptsetup: WARNING: failed to detect canonical device of overlayfs
cryptsetup: WARNING: could not determine root device from /etc/fstab
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.5.0-5-generic /boot/vmlinuz-3.5.0-5-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.5.0-5-generic /boot/vmlinuz-3.5.0-5-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.5.0-5-generic /boot/vmlinuz-3.5.0-5-generic
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-3.5.0-5-generic.postinst line 1010.
dpkg: Fehler beim Bearbeiten von linux-image-3.5.0-5-generic (--configure):
 Unterprozess installiertes post-installation-Skript gab den Fehlerwert 2 zurück

Steps to reproduce:

1.Create a bootable usb stick deployed with Ubuntu12.10. Use for this usb-creator from a Ubuntu12.04 platform.
2.Insert the prepared usb-drive in a computer you want to run with this stick and choose in the bootoptions right after computer powen on to start from usb.
3.See Quantal comming up from the usb-drive(use live mode when it ask - all sessions data/new information will be saved to the stick automatically)
4.Open a terminal
5.sudo apt-get update
6.sudo apt-get dist-upgrade
7.See the warnings/errors like the shown above

Additional:

cryptsetup: WARNING: failed to detect canonical device of overlayfs
cryptsetup: WARNING: could not determine root device from /etc/fstab

are surely caused by the usb installation. I have not set up a /home or other encryptions to the sytem.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.167
ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
Uname: Linux 3.5.0-4-generic x86_64
ApportVersion: 2.4-0ubuntu4
Architecture: amd64
CasperVersion: 1.320
Date: Sun Jul 22 11:15:40 2012
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'1342616755'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'744'
 b'com.ubuntu.update-manager' b'window-width' b'1301'
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120718.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)