upgrade tool should cache downloaded files

[Andrew Clausen]

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".

[Nanley Chery (nanoman)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at [WWW] https://wiki.ubuntu.com/Bugs/FindRightPackage . I have classified this bug as a bug in update-manager.

[Jean-Baptiste Lallement (jibel)]

Thanks for reporting this bug and any supporting documentation. Since this bug has enough information provided for a developer to begin work, I'm going to mark it as confirmed and let them handle it from here. Thanks for taking the time to make Ubuntu better!