With every new update, Unity changes their command line interface a bit, and this is still the case with 2020.1. I spent a few hours getting Unity up and running again within Linux Docker, and wanted to document it for those that follow.

• Unity 2020.1.1
• Unity 2020.1

Unity’s UI (User Interface) Allows a user to interact with your application. More info See in Glossary Toolkit is a collection of features, functionality, resources and tools for developing user interfaces (UI). You can use UI Toolkit to develop custom UI and extensions for the Unity Editor, runtime debugging tools, and runtime UI for games and applications. Unity 2017.4.40. Install this version with Unity Hub. Additional downloads. Select the runtime platforms of your choice from the list below (the desktop runtime is included as standard) or, to install the full complement of runtime platforms, use the download assistant installer above.

Running Unity within Docker is current unsupported, but seems to work if you know the correct incantation of commands. You can read our general approach in this previous article. If you already had Unity 2019.3 running properly in Docker, here are the changes we made to our Docker setup for 2020.1:

1. Activation now requires a special flag to get the .alf. I followed these steps for activation, generally, but here’s the modified command I ran to get the .alf XML string:

   /opt/Unity/Editor/Unity -batchmode -nographics -manualActivation -logFile /dev/stdout -username myemail@gmail.com -password mypassword

   
   

2. When activating, you must not run Unity with xvfb. It will cause a segfault. Use -nographics instead:

   /opt/Unity/Editor/Unity -batchmode -nographics

   
   

3. Once you’ve uploaded the .alf file to Unity’s website, and downloaded the .ulf license file, you can specify the license for subsequent Unity runs using the new flag: -manualLicenseFile

   However, we don’t use this flag, instead we manually inject the license file at the correct path:

   Root User: /root/.local/share/unity3d/Unity/Unity_lic.ulf

   Normal User: /home/username/.local/share/unity3d/Unity/Unity_lic.ulf

If you’re interested in the docker files we use to build our Unity images, here they are. They will, however, need a bit of modification for your own build processes.

• unity_clean_unactivated.Dockerfile — builds an Ubuntu image with Unity installed, but unactivated

• unity_clean.Dockerfile — consumes the previously built image and activates Unity with a .alf file.

Unity 2020.1.1

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Release notes

Known Issues in 2018.4.20f1

• Animation: Animator.Update CPU time spikes when multiple animations are playing(1184690)

• MacOS: [Lighting]Errors in console on changing editor visualization mode to realtime GI if there is a particle system in scene.(1106901)

• Package Manager: Immutable packages altered by the API Updater are reverted to their original state when packages are resolved, which can lead to slower import performance in that context.

• Profiling: Editor crashes when loading profiler file with memcpy stacktrace(1131782)

• Profiling: Performance decrease in EditorOverhead using Deep Profile (1051094)

• macOS: If the Android Tools are not installed through the Hub, macOS 10.15 (Catalina) default security settings will prevent the Android NDK binaries being executed. These settings have to be changed or a signed Android NDK (r16b) will be needed to build Android. More information here: https://developer.android.com/ndk/downloads/older_releases.

2018.4.20f1 Release Notes

Fixes

Unity 2020.1

• AI: Fixed a path-finding bug in which floating point errors would cause agents to take potentially large, spurious detours.(977653)

• Android: Fixed a crash during shutdown when starting a Java thread with a C# thread.(1224810)

• Android: Fixed activity pause timeout warnings.(1223705)

• Asset Import: Added AssetDatabase.DisallowAutoRefresh and AssetDatabase.AllowAutoRefresh to the C# API.(1173031)

• Asset Pipeline: Fixed an issue where AssetBundle Recompression not verifying the CRC of bundle contents when requested.(1195075)

• Asset Pipeline: Optimised copying an asset, so that a refresh of the asset database is not triggered.(1179856)

• Editor: Fixed a crash when calling MonoImporter.GetExecutionOrder(null).(1181615)

• Graphics: Avoid rebinding the texture and polute state if the texture target is unknown.(1199990)

• Graphics: Fixed a crash in SkinnedMeshRenderer: make sure the cached mesh is valid before using it.(1183992)

• Graphics: Fixed an issue loading shaders from a 2017.4 authored asset bundle into more recent Unity versions.(1195317)

• Graphics: Fixed an issue that can cause increased draw call count when using static batching.(1098752)

• iOS: Fixed an issue with profiler support for iPhone XR/XS/XS Max and above.(1133479)

• iOS: Fixed Unity Remote errors when using iPhone XR/XS/XS Max and above.(1184243)

• macOS: IME works in both editor and player is the proper location.(1178930)

• Prefabs: Fixed an issue where editor entering infinite loop on certain bad prefabs. The bad prefabs are now patched during load.(1196082)

• Prefabs: Fixed an issue with applying prefab override from a scene where the MonoBehaviour lives in a namespace and has FormerlySerializeAs on the fields.(1114464)

• Profiler: Added message indicating that Profiler Modules need to be activated to profile.(1197721)

• Scripting: Fixed an issue that raised on iOS where the player would crash when shutting down.(1145982)

• UI: Fixed an issue with IME properly.(1178930)

• Version Control: Fixed an issues with Unity auto refresh and version control.(1191378)

• XR: Fixed a crash when you connect to a Hololens 2 using the HolographicRemoting scripting api and then enable Windows Mixed Reality.

API Changes

• 2D: Added: Added SortingGroup.UpdateAllSortingGroups to allow users to immediately update SortingGroups instead of waiting for LateUpdate.(1202432)

Improvements

• Asset Import: Added AssetDatabase.DisallowAutoRefresh and AssetDatabase.AllowAutoRefresh to the C# API.(1173031)