using the downloaded upgrade packages from one laptop to another

[Abhishek Dixit]

I have upgraded Ubuntu 11.10 (amd64) to 12.04 (amd64)  on one of the
laptops I have,
I have another laptop which is also running 11.10 (amd64)  I want to use
the packages downloaded on the first laptop on the second
laptop so that both have Ubuntu 12.04
 I checked on first laptop (now running 12.04 ) downloaded upgrades are
residing in /var/cache/apt/archives I
 have done an sftp for those packages from laptop 1 to laptop 2.

Now what I want to know is how do I make sure do-release-upgrade uses these
in my laptop and does not downloads
700 mb of updates because this will take 8-10 hours at my end so I want to
utilize the upgrades which were downloaded during the upgrade process
on one of the systems.
If there is a way in this situation let me know.

-- 
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Abhi
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