I found that cryptsetup still needs the custom keyscript to access the
key-file on the external USB device for the encrypted root.

Without the keyscript specified in "/etc/crypttab" cryptsetup doesn't
create an initrd /conf/conf.d/cryptroot file - which maybe should be the
subject of another bug.

For the /var and /home encrypted volumes I also found that this bug will
strike if the USB device isn't inserted very early and given chance to
settle - I find inserting it immediately after GRUB menu, which I have
displayed for up to 10 seconds. If it is inserted only when the kernel
begins running the device isn't ready in time to be mounted according to
the "/etc/fstab" entry and this bug will strike.

-- 
lucid: Failure to bring up cryptsetup devices by key files (when not using 
"splash")
https://bugs.launchpad.net/bugs/532898
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