Tried installing Desktop version on Linux mint 18

[Tut]

There have been several threads indicating the need to update Mono. For example, this one might be helpful:

Updating Manager fails

Type mono -V in a terminal and report back the version. I have 4.6.1 installed. I suspect that you have an earlier version. Check out Install Mono on Linux | Mono Install Instructions: 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