I've reported it as a new bug: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/362466
In addition debug file from the install session in my previous comment is in the attachment.
I've reported it as a new bug: /bugs.launchpad .net/ubuntu/ +source/ ubiquity/ +bug/362466
https:/
In addition debug file from the install session in my previous comment is in the attachment.