PSDImporter | Unity PSD Importer allows Unity to import individual layers | Editor library

I'm a web developer (symfony <3 ;) C# and microsoft technologies are new for me ! ) and during the covid containment I want create a simple game with the game engine unity

On Ubuntu 19.10, I downloaded unity Hub v2.3.0 (https://unity3d.com/get-unity/download)

From unity hub, I installed unity3D v2019.3.7f1 (the lastest stable) with some options (Linux & WebGL & windows build support)

And I created a simple 2D game

All works like a charm, I can open my project and run my new game without any error in the unity3D console

From Unity, when I create a c# script, the file can be opened by my (very simple) text editor gedit. Now I want to install the cross-os IDE visualcode thanks thats I'll get some usefull extensions and autocompletion code when I'll edit my unity scripts.

So, I installed vscode via apt install (I followed this official guide : https://code.visualstudio.com/docs/setup/linux)

My version of vscode is :

After some web search, I understand I must install the .NET framework (maybe I'm wrong ?)

My dotnet version (from a terminal : dotnet --version) is 3.1.201

Next I configured the unity parameter for change the default text editor :

• External Script Editor : code
  • code refer to the path /usr/bin/code, the executable of vscode
• External Script Editor Args : "$(ProjectPath)" -g "$(File)":$(Line):$(Column)
  • value by default, I changed nothing

I created a simple c# script from unity, I opened the file and vscode opened automatically (yeah !). And from vscode I added two public variables (the bool 'a' and the Rigidbody2D 'b')

I saved my script and go to unity app, the variables a and b are visible on the interface :

All works ! But now, I want have the autocomplete code from vscode. So, I installed the vscode c# extensions. But when the installation finished, this message appears :

The whole of log is :