Here is how to install the most recent stable version of Mono (version 18.104.22.168_1).
Download the file here:
I downloaded the file to the desktop, and then I opened up the terminal and typed:
That Changed the directory to /home/USERNAME/Desktop. From there I ran:
chmod +x mono-22.214.171.124_1-installer.bin
./mono-126.96.36.199_1-installer.bin –mode xwindow
and then you just click a couple of next’s and ok’s, and then Bob’s your uncle.
If you have any questions please leave them in the comments so that the answers can be helpful to all.