Public bug reported:

https://access.redhat.com/documentation/en-
us/red_hat_enterprise_linux/6/html/storage_administration_guide/ch-
volumekey

Attempting to generate an escrow-packet as documented at the above link
fails with the following error:

```
sudo volume_key --save ./luks.img --output ./escrow-packet

volume_key: Error opening `./luks.img': Error getting information about volume 
`./luks.img': Invalid argument
```

The exact same command works on Fedora Workstation 38.


To replicate the issue, do the following:
- On Ubuntu 22.04 (haven't tested other releases)

- Install `volume-key` package

- Generate a LUKS encrypted volume
```
# Pre-allocate a 1GB volume
sudo fallocate -l 1GB ./luks.img

sudo cryptsetup luksFormat ./luks.img
# Follow prompts to setup the volume with a passphrase
```

- Try to generate the escrow-packet
```
sudo volume_key --save ./luks.img --output ./escrow-packet
```

** Affects: volume-key (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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Desktop Bugs, which is subscribed to volume-key in Ubuntu.
https://bugs.launchpad.net/bugs/2029216

Title:
  Generating an escrow-packet fails

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