How to re-use encrypted volume

[Josef Wolf]

On Fri, Jan 01, 2010 at 07:54:12PM +0100, Josef Wolf wrote:
> Hello,
> 
> With ubuntu-8.10, I had created an encrypted data partition on my laptop
> to protect privacy in case it would be stolen (or lost, or whatever).
> 
> Now, I'd like to install 9.10 (I use the alternate CD for installation),
> but re-use that data partition. When I enter the "configure crypted volumes"
> menu, I select the partition, then I enter the passphrase, and then I get
> an error message saying that configuration failed.
> 
> So how am I supposed to re-use an existing encrypted volume?
> 
> Any hints?

No hints?