Public bug reported:

The new code to lowercase all UUIDs is breaking NTFS mounts because
those have UPPERcase UUIDs exclusivly.  The correct fix would be to make
blkid handle this as it knows what range of values the various UUIDs
have and whether upper/lower casing them is even safe.

For initramfs-tools it is clear we should be checking that the UUIDs
unmodified before attempting to change their case.  This guearentees
existing installs are never affected.  We should likely also only case
map those in a known UUID format which is case insensitive.

** Affects: initramfs-tools (Ubuntu)
     Importance: Critical
     Assignee: Andy Whitcroft (apw)
         Status: In Progress

** Changed in: initramfs-tools (Ubuntu)
       Status: New => In Progress

** Changed in: initramfs-tools (Ubuntu)
   Importance: Undecided => Critical

** Changed in: initramfs-tools (Ubuntu)
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Changed in: initramfs-tools (Ubuntu)
    Milestone: None => ubuntu-16.03

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https://bugs.launchpad.net/bugs/1553107

Title:
  initramfs-tools: UUID checks now fail for NTFS which has upper cases
  UUIDS

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