I can reproduce this problem and similar on a system with fast drives and going quickly through the timezone and user details steps. We start altering the disk while partman hasn't yet finish to prepare it.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1847748 Title: installer crashed - Cannot resolve path /dev/sdN - Failed to mount /target To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1847748/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs