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phoenix-dragon
I was able to replicate the 404 repository error in Lubuntu 14.04. I did not see this in other versions of Ubuntu so far but now that I have confirmed this errir I will make correcting it my top priority. Do not download my program until I have this issue fixed.
The solution for removing the 404'd repositories is to open the software centre application, then select settings > Software Properties >Other Software, and then selecting and removing the items that generate 404 errors. The solution posted in forums did not work but removing them in this manner worked perfectly.
CAUTION: remove only the ones that are causing 404 errors. You can get them listed by typing sudo apt-get update.