"blender" has no known programs associated with it

I tried following the instructions here: https://wiki.blender.org/wiki/Building_Blender/Linux/Ubuntu
to build blender but when I try to run the file I get a dialog: “Unknown file type” the file “blender has no known programs associates with it.” Is there something I’m doing wrong?

Linux Mint 19.2
AMD Ryzen

How are you trying to run Blender? It looks like you’re double-clicking from a file browser. Try running it from a terminal instead.

See this topic:

We should probably do this by default though, and not only for buildbot/release builds.

That did it. Thank you for your help. Building 2.83a seems to have fixed my gpu compute problem too. Thanks again.