[Bug 1887373] [NEW] upgrade from 18.04 to 20.04 hangs on lvm2 snapshot

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When trying to upgrade my Kubuntu 18.04 to Kubuntu 20.04 by running

sudo do-release-upgrade -d

I get at a point where the installer reads:

...
    File descriptor 3 (pipe:[366994]) leaked on vgs invocation. Parent ID 31982: /usr/sbin/grub-probe

...
grub-probe: error: unknown filesystem.
    File descriptor 3 (pipe:[366994]) leaked on vgs invocation. Parent ID 31982: /usr/sbin/grub-probe
...

Found Ubuntu 18.04.4 LTS (18.04) on dev/,apper/kubuntu--vg-snap
Adding boot menu entry for EFI firmware configuration
done
...

At this point the installer hangs for at least 35 min. Killing it and
restarting leads to a kernel panic.


This is on a laptop with lvm2, using an lvm snapshot before the upgrade

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
upgrade from 18.04 to 20.04 hangs on lvm2 snapshot 
https://bugs.launchpad.net/bugs/1887373
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