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To licensing Arnold, I tried to use Autodesk Network License Manager for Linux.But it does not support Ubuntu. So, how I can get license?
Did you try? There's other Autodesk customers running on Ubuntu
And you could always run the license manager in a VM.
For questions about the Autodesk Network License Manager, you'll have to use Autodesk support, or the Autodesk Installation and Licensing forums.