I have found a workaround:
run installer from a commandline with this parameter
ubiquity --no-migration-assistant

I wish that the error message that crashed ubiquity installer displays 
contained text
"Try running the installer with this option: ubiquity --no-migration-assistant 
to prevent ubiquity from trying to mount existing partitions"

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https://bugs.launchpad.net/bugs/773419

Title:
  The installer crashed when attempting to "migrate data from other
  systems"

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