Long over due promise to share this Cinnamon Session fix.
If you have ever tweaked your Linux Mint distro as I have to the point of a black screen and receiving this messge as it fails to boot;
[unable to launch “cinnamon-session-cinnamon” X session — “cinnamon-session-cinnamon” not found; falling back to default]
Here is one of the Mint threads I found to help me fix the issue rather easily.
If you have any questions, let me know and I will do my best to answer them.