运行具有本机依赖项的.NET Core nuget包，找不到库

Question

我已将这些添加到我的项目中。

<Content Include="../../native/medxdcmtk/lib/libmedxdcmtk.so">
  <PackagePath>runtimes/debian-x64/native/libmedxdcmtk.so</PackagePath>
  <Pack>true</Pack>
</Content>
<Content Include="../../native/dcmtk/lib/libdcmtk.so.10">
  <PackagePath>runtimes/debian-x64/native/libdcmtk.so.10</PackagePath>
  <Pack>true</Pack>
</Content>
<Content Include="../../native/medxdcmtk/lib/libmedxdcmtk.so">
  <PackagePath>runtimes/ubuntu-x64/native/libmedxdcmtk.so</PackagePath>
  <Pack>true</Pack>
</Content>
<Content Include="../../native/dcmtk/lib/libdcmtk.so.10">
  <PackagePath>runtimes/ubuntu-x64/native/libdcmtk.so.10</PackagePath>
  <Pack>true</Pack>
</Content>

生成的包看起来像：

当我调用使用PInvoke的方法时，我得到了这个：

Error Message:
 System.DllNotFoundException : Unable to load DLL 'libmedxdcmtk': The specified module could not be found.
 (Exception from HRESULT: 0x8007007E)

这在ubuntu和debian（64bit）上都会发生。如果我将.so文件直接复制到/usr/lib，则可以正常工作。

为什么找不到我的原生组件？