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.
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. vgubuntu- preupgrade
Found Ubuntu 19.10 (19.10) on /dev/mapper/
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.