For reference, the cause of this problem is that FSharp.Core.dll needs to be rewritten using the Mono key in github.com/mono/mono/raw/master/mcs/class/mono.snk, as described in bugzilla.novell. com / show_bug.cgi? id = 615445 The solution to this problem is to re-sign F # dll (download mono.snk and then run "sn -q -R FSharp.Core.dll mono.snk") as described by sepp2k.
However, since F # .deb ready-made packages for Ubuntu are now available at http://fsxplat.codeplex.com/ , which work out of the box without having to re-sign the dll, you can simply use them.
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