Created attachment 704522 [details]
y2log.tar.xz
the attached log reports the two failures:
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2016-12-01 19:07:27 <3> twppc64le(13519) [Ruby] yast/wfm.rb:222 Client call
failed with 'undefined method `default_subvol_from_product'
...
2016-12-01 19:10:00 <3> twppc64le(13519) [Ruby] yast/wfm.rb:222 Client call
failed with 'undefined method `fetch' for false:FalseClass'
===