If you are running a network of Ubuntu machines (more than 1), installing your own cache is a good idea. You can chain caches, so you can point your cache to the central Ugandan cache.
Here is a very simple tutorial to install apt-cacher:
sudo apt-get install apt-cacher
sudo pico /etc/apt-cacher/apt-cacher.conf
We need to point apt-cacher to the Ugandan cache, so change :
# Apt-cacher can pass all its requests to an external http proxy like
# Squid, which could be very useful if you are using an ISP that blocks