If you are a linux promoter then you get situations where you want to update your friend's system quickly.
Then there is a workaround for you. Follow these steps::
1. copy your updates from any system{updated system} the files are located in /var/cache/apt/archive
as .deb packages
2. Open any folder as administrator
3. Then copy all update to the folder /var/cache/apt/archive
now update your system as usual..
This may save your 30-40 min depends upon number of updates......
Thanx,
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