Failure while unpacking required packages error while doing debootstrap --second-stage on emdebian grip

Hi,

   I have setup grip on my device(a mini2440) but when I do a 
/debootstrap/debootstrap --second-stage I get
W: Failure while unpacking required packages.  This will be attempted up to 
five times.

I have done sudo debootstrap --arch=armel --foreign squeeze grip/ 
http://www.emdebian.org/grip/  to setup the bootstrap on ubuntu.

The tail of debootstrap.log shows

Errors were encountered while processing:
 /var/cache/apt/archives/dash_0.5.5.1-7.4em1_armel.deb

How can I fix this?

Thanks.