Xavier,

There are two configurations for such devices that are supported by
karmic:

- configure the filesystem as 'bootwait' in /etc/fstab.  This will block the 
boot indefinitely waiting for the device, to ensure that slow hardware does not 
prevent the passphrase prompt from being displayed.
- configure the filesystem as 'noauto' in /etc/fstab, and configure the crypted 
device as 'noauto' in /etc/crypttab.  You will not be prompted for a passphrase 
at boot time; you will need to manually run 'cryptdisks_start' and 'mount' 
after you've logged in.

There simply is no reliable way to prompt for the passphrase *only* when
the device is available, because unless 'bootwait' is set, there's
nothing to prevent gdm starting while you're in the middle of typing in
your passphrase.

-- 
cryptsetup starts too early
https://bugs.launchpad.net/bugs/454898
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