.NET Core: error: libc.musl-x86_64.so.1: cannot open shared object file: No such file or directory

Question

I recently moved from Visual Studio (Windows) to Visual Studio Code (Ubuntu Linux), and due to patchy beta .NET 5 support, I re-targeted from .NET 5 to .NET Standard 2.0 library projects (as I should have in the first place), and .NET 5 to .NET Core 3.1 on my executable projects. The transition seemed to go smoothly...

...but when I run the executable, I get this error:

Failed to load �߻, error: libc.musl-x86_64.so.1: cannot open shared object file: No such file or directory
The library libhostfxr.so was found, but loading it from /home/.../dotnet/host/fxr/5.0.0-preview.3.20214.6/libhostfxr.so failed
  - Installing .NET Core prerequisites might help resolve this problem.
     https://go.microsoft.com/fwlink/?linkid=2063370

Output of ldd:

linux-vdso.so.1 (0x00007ffd03dfd000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fca18105000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fca180ea000)
        libc.musl-x86_64.so.1 => not found
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fca17f9b000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fca17da9000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fca1834f000)

Also, I am running on Ubuntu 20.04. However, I followed the SDK installation instructions for 18.04, as (at the time) there was no instructions for 20.04.

Answer 1

It was an installation misconfiguration problem.

To prevent an issue like this from arising again:

• Do not install the Snap version.
• Do not have conflicting binaries in your system. This confused my system a bit because I had installed from the package manager and also had an unzipped/configured binary in my home directory.