Thanks Stefan.

Ubuntu will never mount a filesystem with multiple signatures, since it
cannot know which is correct and getting it wrong could badly corrupt
the filesystem.  You'll need to use wipefs to remove the signature that
is incorrect.

I'd recommend backing up the device first, you probably only need the
first megabyte at most, try:

  # dd if=/dev/mapper/var of=var.bak bs=1M count=1

Then

  # wipefs -o 0x438

After that, blkid -p /dev/mapper/var should only return the btrfs data
and the drive should be mounted

** Changed in: udev (Ubuntu)
       Status: Incomplete => Invalid

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does not mount decrypted secondary luks crypttab partitions (btrfs)
https://bugs.launchpad.net/bugs/508848
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