I had the same issue with standart upgrade procedure (Adept's "Version
upgrade" since I am using Kubuntu).

There was an error window on stage "Getting new software channels ->
Checking update manager", which tells something like "Unable to
authenticate some packages" and lists over 100 ones, and there was no
way of proceeding the upgrade.

I was using one of official Russian mirrors (mirror.yandex.ru) and
switch from it to the official repo fixed the problem. Perhaps you
should notify them or remove Yandex from advised mirrors.

-- 
error authenticating some packages_Kubuntu 8.04 upgrade
https://bugs.launchpad.net/bugs/227420
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