C# Build Failing with F# Errors, Even When Project Does Not Use F#

When building my project, it is failing with the error:

The command “sudo apt-get install -qq mono-complete mono-vbnc fsharp nuget referenceassemblies-pcl” failed and exited with 100 during

A few lines above that, it states:

! Assembly /usr/lib/mono/fsharp/FSharp.Core.sigdata does not exist

However, my project does not use F#. I created some test projects, but they are all using C# and .NET core.

The build that is failing is here:

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