This page documents migration issues and solutions I encountered when migrating from Warty to Hoary on desktops and servers. Issues covered thus far:

apt-proxy

When you try and restart apt-proxy after the migration to Hoary you will get the following message:

$ sudo /etc/init.d/apt-proxy restart
Stopping apt-proxy.
Starting apt-proxy
Failed to load application: string index out of range
.
$

To rectify this problem, you will need to edit /etc/apt-proxy/apt-proxy-v2.conf and run the following command:

:%s/timeout =/;timeout =/

Which will comment out the blank timeout variable which will result in apt-proxy using it's own default timeout. You could also set your own preferred timeout at this point instead of the default too.