Add Linux Module to Unity for Server Builds - Alteredux/XR GitHub Wiki

  1. Open the Unity Hub
  2. Go to Installs in the left menu
  3. On the desired Unity version, click on the 3 dots
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  4. Select Add Modules
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  5. Under Platforms, select Linux Build Support for IL2CPP and Mono
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  6. Click Next, agree to terms and conditions and click Done