Editor screen won't load in Elementary Juno (Ubuntu 18.04)

I am trying to run Unity3D on Elementary Juno which is (basically) Ubuntu 18.04 underneath with the Pantheon desktop environment as the UI. When I run Unity, I get the screen to open a project and everything seems normal. However, after selecting a project (or creating a new one), the Unity window appears, but the actual editor screen does not load in the window. The screenshot below shows what I am talking about. In the screenshot, I have opened a project in Unity, but instead of seeing the editor inside of the Unity window I see my desktop background. Inside the Unity window is like an image of my desktop when I launched Unity.

https://imgur.com/xpgPvQI

Has anyone experienced this or know what I can try to test? I'm not sure how to describe the error so I haven't been successful at finding a solution on Google. I think it's a...compositing issue? Or a redrawing issue? I think the issue could be with my gpu drivers, but I'm just not sure. I can interact with the top menu buttons (File, Edit, Window, etc). I can drag the window around, maximize it, and close it fine. But I cannot see or interact with anything in the area that the actual Unity editor should show.

My GPU is a Nvidia GTX 960. I am using the proprietary drivers on Linux. I have gone into the Nvidia Powermizer settings and changed the performance to max performance.

glxinfo | grep version

returns:

Code (csharp):

1. server glx version string: 1.4
2. client glx version string: 1.4
3.  
4. GLX version: 1.4
5. OpenGL core profile version string: 4.6.0 NVIDIA 390.77
6. OpenGL core profile shading language version string: 4.60 NVIDIA
7. OpenGL version string: 4.6.0 NVIDIA 390.77
8. OpenGL shading language version string: 4.60 NVIDIA
9. OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 390.77
10. OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
11. GL_EXT_shader_implicit_conversions, GL_EXT_shader_integer_mix,

Note that my OpenGL version is 4.6, but at the top of my Unity window it says OpenGL 4.5. Could it be something with that? If so, then is there a way to downgrade my OpenGL without breaking stuff in my system? Or can I downgrade and run the downgraded version only for this application?

I checked all the dependencies listed in one of the sticky posts and I have all of them.

I have this error using two methods of installing Unity:

1) Installing Unity with the latest UnityHub AppImage.

2) Installing Unity based on the instructions here: https://askubuntu.com/questions/1077816/how-to-install-unity3d-on-ubuntu-18-04. One interesting thing is that with this method, everything works if I run Unity as root 'sudo unity3d'. However, opening a project as root makes some of the files be owned by root so I can't open it as non-root again.

Currently, I am using UnityHub. If I run UnityHub as root, then I still see the problem.

Does anyone know what may be wrong or what I can test for? Any help is appreciated.

 

Update: I am able to get the editor screen showing, but some issues still exist.

I am able to get the editor screen going by doing 'export GTK_CSD=0' and then running the UnityHubSetup.AppImage file. This loads the editor screen pretty reliably.

However, the file chooser does not load. I can select "Open scene" or "Open project", but the file chooser window never shows. An error message shows up when I run the app image that would explain this. When I run the AppImage, the first message is:

Gtk-Message: 20:33:59.322: Failed to load module "pantheon-filechooser-module"

When I run 'env | grep -i gtk' I see:

GTK_CSD=0

QT_QPA_PLATFORMTHEME=gtk3

GTK_MODULES=:pantheon-filechooser-module:gail:atk-bridge

So I guess the problem is that Pantheon runs GTK3, but Unity needs GTK2. Is there any work around for this? I can run Unity by setting GTK_CSD=0, but it is kind of a hassle to not be able to use a file chooser.

 

Are you sure you installed all dependencies?

Try this in a terminal.

Code (CSharp):

1. sudo apt-get install libgtk2.0-0 libsoup2.4-1 libarchive13 libgconf-2-4 libnspr4 p7zip-full tar gzip cpio zip gconf-service lib32gcc1 lib32stdc++6 libasound2 libc6 libc6-i386 libcairo2 libcap2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libfreetype6 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libgl1-mesa-glx libglib2.0-0 libglu1-mesa libgtk2.0-0 libnss3 libpango1.0-0 libstdc++6 libx11-6 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxtst6 zlib1g debconf npm

To be sure try to reinstall unity as well and then it should work.
I used elementary a while ago and had the same issues, after installing all dependencies it worked as expected, without any commandline arguments from the terminal. Try to use Unity Hub everytime for anything.

 

I copied your command into the terminal and everything was installed. I re-installed Unity via UnityHub. No changes though, same problems. I will probably just switch back to vanilla Ubuntu with Gnome installed.