Ignorance is not an excuse. The second source in your list exists for one purpose only. To allow you to install apps and tweaks which enable you to steal software. When you add it to Cydia it gives you a warning to this effect.
You were given 3 tips. All 3 are valid, and number 2 answers your question precisely, even if the other two are a bit facetious. I suggest you read them all again. It is because you are adding unreliable sources that you are having problems for the reasons stated.
We don't support or condone piracy here. My point is that when you blatantly show us that you do, why should any of us feel motivated to help?
Since that's a rhetorical question, I'll close the thread now to avoid opening this up to any further debate, which could be counterproductive.