package memtest86+ 4.20-1.1ubuntu1 failed to install/upgrade: Process hanged (grub+ os-probe + lvm error) and was manually killed

[T T]

Getting: /dev/dm-1: read failed after 0 of 4096 at 0: Input/output error

/boot is sda2 and
/ (root) is on lvm (/dev/VG/rootfs = lvm sda6)

Reason could be with group-mount trying to mount lvm snapshot

Removing that snapshot and running update-grub and dpkg-reconfigure memtest86+ everthing works

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: memtest86+ 4.20-1.1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic-pae 3.0.22
Uname: Linux 3.0.0-17-generic-pae i686
ApportVersion: 2.0.1-0ubuntu3
Architecture: i386
Date: Sat Apr 14 22:28:40 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script was killed by signal (Terminated)
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
SourcePackage: memtest86+
Title: package memtest86+ 4.20-1.1ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script was killed by signal (Terminated)
UpgradeStatus: Upgraded to precise on 2012-04-14 (0 days ago)

[Launchpad Janitor (janitor)]

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