[Bug 1876506] Proposed package removed from archive

[Chris Halse Rogers]

The version of memtest86+ in the proposed pocket of Focal that was
purported to fix this bug report has been removed because one or more
bugs that were to be fixed by the upload have failed verification and
been in this state for more than 10 days.

** Changed in: memtest86+ (Ubuntu Focal)
       Status: Fix Committed => Won't Fix

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https://bugs.launchpad.net/bugs/1876506

Title:
  eoan to focal upgrade hangs when lvm snapshot is present

Status in memtest86+ package in Ubuntu:
  Fix Released
Status in os-prober package in Ubuntu:
  Confirmed
Status in memtest86+ source package in Focal:
  Won't Fix
Status in os-prober source package in Focal:
  Confirmed

Bug description:
  [Impact]
  Upgrading on LVM systems with snapshots hangs

  [Test case]

  - Install VM with eoan, LVM
  - Create snapshot of root
  - Upgrade memtest86+ to focal (download deb and apt install it is enough)

  This hangs, when it shouldn't.

  [Regression potential]
  The change to memtest86+ closes file descriptor 3 when invoking update-grub like other callers do, which fixes the issue. File descriptor 3 is the debconf socket. If update-grub would need to communicate with debconf, it couldn't anymore. But seeing that we do this everywhere else, this should be fine.

  [Original bug report]

  When upgrading from 19.10 (w/ LVM + encypted disks) to 20.04, the
  installer hangs when trying to probe an LVM snapshot volume created
  before the upgrade.

  Steps to reproduce:

  lvcreate -s -L 20G -n preupgrade /dev/vgubuntu/root
  do-release-upgrade -d

  The installer will hang after the following message:

  /usr/sbin/grub-probe: error: unknown filesystem.
  Found Ubuntu 19.10 (19.10) on /dev/mapper/vgubuntu-preupgrade
  done

  Resolution:

  Killing the grub-mount process which is probing the LVM snapshot seems
  to unhang the installer and allow the upgrade to complete without
  issue.

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