For every release, the ubuntuforums Staff pulls together a thread to keep all in one place most common upgrade bugs and workarounds.
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I had kept a Sony Vaio laptop (VGN-C2S series with intel everything) running on Hardy to test the upgrade to Lucid with
update-manager. Worked fine, aside from a
flashplugin-nonfree problem that broke
The workaround is listed at the top of the post, as it can be a real stopper for new users :
sudo rm /var/lib/dpkg/info/flashplugin-nonfree.prerm sudo dpkg --remove --force-remove-reinstreq flashplugin-nonfree sudo dpkg --purge --force-remove-reinstreq flashplugin-nonfree
(found in an older bug report).
The bug will not prevent a reboot after the install and can be fixed later on.