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This is a regression as the same nuget binary used to work before. The exception is below:
dylan@ubuntu-server:/var/www/Code/dylannet/dylandotnet/nuget$ nuget pack *.nuspec
The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.
1) Could not load type 'System.Collections.HashHelpers' from assembly 'mscorlib, Version=126.96.36.199, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
Resulting in: An exception was thrown by the type initializer for NuGet.Commands.PackCommand
Resulting in: An exception occurred while trying to create an instance of type 'NuGet.Commands.PackCommand'.
Resulting in: Cannot activate part 'NuGet.Commands.PackCommand'.
Element: NuGet.Commands.PackCommand --> NuGet.Commands.PackCommand --> AssemblyCatalog (Assembly="NuGet, Version=2.8.50926.602, Culture=neutral, PublicKeyToken=null")
Resulting in: Cannot get export 'NuGet.ICommand (ContractName="NuGet.ICommand")' from part 'NuGet.Commands.PackCommand'.
Element: NuGet.ICommand (ContractName="NuGet.ICommand") --> NuGet.Commands.PackCommand --> AssemblyCatalog (Assembly="NuGet, Version=2.8.50926.602, Culture=neutral, PublicKeyToken=null")
Resulting in: Cannot set import 'NuGet.Program.Commands (ContractName="NuGet.ICommand")' on part 'NuGet.Program'.
Element: NuGet.Program.Commands (ContractName="NuGet.ICommand") --> NuGet.Program
I cannot reproduce the issue. It works with my sample nuspec
mono ~/Downloads/NuGet\ \(1\).exe pack a.nuspec
Attempting to build package from 'a.nuspec'.
Successfully created package 'PackageWithGacReferences.1.0.nupkg'.