How I Fixed: Mono location is not specified in settings correctly and can not be discovered automatically. Please check Mono settings under File | Settings | Build, Execution, Deployment | Toolset and Build

For everything in life there is a JetBrains product. Right? Right.

So for C# development when using Linux, I wanted to use JetBrains Rider.

All went well, I needed to upgrade to Ubuntu 21.04 to install dotnet, but surprisingly, that all went off without a hitch. No full OS reinstall needed! Miracles do happen. I should put on a lottery ticket.

Anyway, by and large my dotnet’ing then went well enough. At least for the stuff I was doing (tutorials and exercism exercises, mainly). But then one day (today, just now) I wanted to debug something, and when I tried I got the message:

Mono location is not specified in settings correctly and can not be discovered automatically. Please check Mono settings under File | Settings | Build, Execution, Deployment | Toolset and Build

Being a dotnet newb, I didn’t fully understand why / what Mono is. As best I recalled from some previous work with Unity, Mono was a kind of editor that worked cross platform? Is that even the same thing? Who the heck knows.

Anyway, after a few failed attempts at fixing this following anonymous folk on StackOverflow (copy > paste > run > curse!), I discovered the answer. Very simple. Bit of a face palm moment:

sudo apt install mono-devel

So, err, yeah. Won’t work if it’s not installed.

Easy peasy.

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