[Bug 1876506] [NEW] eoan to focal upgrade hangs when lvm snapshot is present

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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.

** Affects: debconf (Ubuntu)
     Importance: Critical
         Status: Confirmed

** Affects: debconf (Ubuntu Focal)
     Importance: Critical
         Status: Confirmed


** Tags: eoan2focal id-5ecfe91fc5987a8563b27f1f
-- 
eoan to focal upgrade hangs when lvm snapshot is present
https://bugs.launchpad.net/bugs/1876506
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