Public bug reported:

When you upgrade to Gutsy Gibbon over the internet, the first step is to 
download some upgrade program.
For some reason, the upgrade program is not obtained via apt-get, so if the 
download fails at any point, the whole process must be restarted.

Since I have an unreliable wireless network, I had to restart the
process about 20 times, taking about 10 hours.  If the upgrade process
cached previous downloads, I expect it would have taken about 20 minutes
instead.

One simple solution would be to package all upgrade components in .deb 
packages, and fetch them using apt-get.
eg: there could be a package called "gutsy-gibbon-upgrade.deb".

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
upgrade tool should cache downloaded files
https://bugs.launchpad.net/bugs/173065
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