It appears to be because since November, we changed partman to create
LVM installs without a separate /boot. Unfortunately, /boot is still
required for LVM+crypto, as grub2 by itself can't load cryptodisks
(unless the option is enabled, that is), and doing so would make it
necessary to unlock the cryptodisk twice -- once for grub, and another
time for the kernel.

For now, let's just make sure crypto still uses a /boot partition.

** Also affects: partman-auto-lvm (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: partman-auto-lvm (Ubuntu Zesty)
       Status: New => Triaged

** Changed in: partman-auto-lvm (Ubuntu Zesty)
   Importance: Undecided => Critical

** Changed in: partman-auto-lvm (Ubuntu Zesty)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox)

** Changed in: partman-auto-lvm (Ubuntu Zesty)
    Milestone: None => ubuntu-17.02

** Changed in: grub-installer (Ubuntu Zesty)
       Status: Triaged => Invalid

** Also affects: ubiquity (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ubiquity (Ubuntu Zesty)
       Status: New => Triaged

** Changed in: ubiquity (Ubuntu Zesty)
   Importance: Undecided => Critical

** Changed in: ubiquity (Ubuntu Zesty)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox)

** Changed in: ubiquity (Ubuntu Zesty)
    Milestone: None => ubuntu-17.02

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https://bugs.launchpad.net/bugs/1659448

Title:
  grub fails to install bootloader for zesty LVM with Encryption

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