Is my LUKS header corrupted?

Greg Laun <[email protected]>
Newsgroups gmane.linux.kernel.device-mapper.dm-crypt
Message-ID <CAApG7_rajZY+=cFP2MfKocNM53yX7G16gf8c-1xrimRNX3TfZg@mail.gmail.com>
I have a LUKS-encrypted hard drive partition that is showing the following
behavior on Kubuntu 19.04:

1. If I enter the correct passphrase, Kubuntu drops into emergency mode. If
I enter the incorrect passphrase, Kubuntu asks for the passphrase again.

2. If I run cryptsetup luksOpen <target device> myName with the correct
passphrase, it tells me "No key available with this passphrase."

Does anybody know what would account for this behavior? How is Kubuntu's UI
layer able to take a different code path based on the correct passphrase if
dm-crypt no longer recognizes the passphrase?

Is it possible there are arguments to luksOpen that I can pass to have the
passphrase recognized again?

The passphrase worked 4 days ago. The machine was powered down accidentally
by an unruly toddler, but I'm not sure if that's enough to corrupt the LUKS
header.

Thanks for any help/info!
Greg

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