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
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