Well, i cannot reproduce... My installation is working, i have the dialog informing me about
msfrpcd being shut down, and it asks me if i want it to start on my behalf. Then i click yes and everything goes as it needs to. I don't know if it's a memory issue, since i'm running it fine on my virtual machine with 1Gb RAM, so even less powerful than your physical installations.
You can try starting
armitage from the terminal and looking at the messages it outputs.
Also, did you try to follow the suggestion at the url you got?
Let us know!
Oh, and welcome anyways
