Thanks for the link, I had run across that post in my endeavors to solve the problem but got hung up with the same error the poster got "E: Unable to locate package ca-certificates-mono", and I then tried the posted fix with no success (mozroots: command not found). So, I explored the 'ca-certificates-mono' path more and I think I found a way to at least get it "installed":
sudo rm /etc/apt/sources.list.d/mono-xamarin*
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb
http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
sudo apt-get update
So, it did a bunch of stuff and now I can at least the install to show it's installed and the newest version, but it still does not work. Same error as before from the HG log.
So, I looked for a bigger stick, found "sudo apt-get install mono-complete" and then was able to use the fix from the other post (mozroots).. It then worked!!!
I'm afraid to think about what all I have done to my poor OS, so now it's off to reload from scratch and do the bare minimum of all this goofing around to get the cert to work.
Thanks!