[Bug 1553107] Re: initramfs-tools: UUID checks now fail for NTFS which has upper cases UUIDS

[Manoj Iyer]

I was able to boot with both upper and lowercase PARTUUID using:

$ apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.122ubuntu6~rc2
  Candidate: 0.122ubuntu6~rc2
  Version table:
 *** 0.122ubuntu6~rc2 500
        500 http://ppa.launchpad.net/apw/initramfs-tools-test/ubuntu xenial/main arm64 Packages

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

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

Status in initramfs-tools package in Ubuntu:
  In Progress

Bug description:
  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.

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