One must have "/boot" unecrypted (something like 200MB ext4 should be plenty). The fact that manual partitioning is allowing you to start installation is worrying as the underlying partman has safety check to check that there is a /boot setup, when required.
** Changed in: ubiquity (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1077129 Title: Encrypted installation crashes . Failed to mount the target: /target To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1077129/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs