Fixing the Unity3D 5.3 startup error on Linux

If you experience this error with the newest Unity3D Build on Linux, just do this one simple step:

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Create the folder `~/.local/share/unity3d` and you are good to go!

__Now have fun with Unity!__

In more detail, the "main" error message in `~/.config/unity3d/Editor.log` is

> CopyPackageFile failed, unable to copy /opt/Unity/Editor/Data/Resources/Packages/unity-editor-home-0.0.7.tgz to /home/luca/.local/share/unity3d/Packages/unity-editor-home-0.0.7.tgz

>

> CopyPackageFile failed, unable to copy /opt/Unity/Editor/Data/Resources/Packages/unityeditor-cloud-hub-0.0.1.tgz to /home/luca/.local/share/unity3d/Packages/unityeditor-cloud-hub-0.0.1.tgz