No way to drop back to Ubuntu Lucid if the packages were upgraded. Even if some of them failed to...
Do you mean the upgrade was not successful? If so, are you able to boot Ubuntu now? Can you see the desktop?
Regarding the speed of downloads, you can go to Software Center > Edit > Software Sources > Change Server > Choose Best Server.
If you can see the desktop, we would want to see the output of these commands from Applications > Accessories > Terminal.
Code:
sudo apt-get update && sudo apt-get upgrade
Code:
sudo apt-get dist-upgrade
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