Upgrade or installation fails with the message:

Calling the YaST module 'inst_disk_proposal' has failed.

I tried an upgrade from a downloaded ISO and then also tried to make an
installation from a live system after updating it with newer modules to allow
for a possibly updated YaST.

The error occurs when the partitioning of the disk is reviewed. I asked to keep
the partitioning. 

My laptop is dual booting with Windows 10.

The update succeeded on a second notebook, which is configured almost
identically.

However, the following differences exist on the current notebook:
1. The partition table has a gap because /dev/sda5 does not exist.
2. The partition table includes mount points for external disks, which were not
attached in the upgrade process.