Error in upgrading to 10.04

[coolmate]

Hi all,

I am upgrading my ubuntu to 10.04. There are errors blocked me as the below:

Could not install '/var/cache/apt/archives/xxxx.deb'

The upgrade will continue but the '/var/cache/apt/archives/libtasn1-3_2.4-1_i386.deb' package may not be in a working state. Please consider submitting a bug report about it.

subprocess dpkg-deb --control returned error exit status 2

where xxxx is deb file name in /var/cache/apt/archives

I looked into there and they do exist.

Any idea for how to fix this?

I tried from 8.04 9.04 and 9.10, all gave me same erro.

Thanks