Steve: I must be missing something here.. how do we know which UUIDs is
the correct one? Especially with removable media?

And yes, you could use the uuid parameter from root boot option and
patch blkid to force read the uuid's from every type of signature it
founds and then guess the right type by matching the uuid's and...

Blkid is doing the right thing. It clearly indicates that there are
multiple signatures and refuses to do any guess work. The fact that we
are in this situation because of buggy cryptosetup is unfortunate (same
will happen with any mkfs which does not clear the superblock).

Now we just have to deal with the defected superblocks out there and in
my opinion patching and changing working software that's doing what it
suppose to do just to deal with buggy legacy is not the way to go. There
are situations where that most probably goes wrong as we guess wrong and
trash users data (how about activating a "new" swap partition which in
fact is encrypted luks partition).

We can clearly detect the situation and we can inform the users about it
and we can help them fix it for good. Users know which signature is the
correct one. Let's leave the decision to the user, but give all the
information and help we can to make it a correct one.

-- 
luks encrypted partition not detected or mounted automatically
https://bugs.launchpad.net/bugs/428435
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