I was thrilled to find out that I could do development with Unity on Ubuntu 18.04. I had decided to use VS Code as the C# script editor. However, I encountered a frustrating problem – IntelliSense was broken – and I banged my head against a wall for a couple of hours because of it.
VS Code outputted the following error to the console:
The reference assemblies for framework ".NETFramework,Version=v3.5"
were not found. To resolve this, install the SDK or Targeting Pack for
this framework version or retarget your application to a version of the
framework for which you have the SDK or Targeting Pack installed. Note that
assemblies will be resolved from the Global Assembly Cache (GAC) and will be
used in place of reference assemblies. Therefore your assembly may not be
correctly targeted for the framework you intend.I tried multiple things. I installed Mono with apt-get. I tried to install Mono from Homebrew. I changed the Unity .NET Framework version. Nothing helped.
Then I came across this link. It resolved the issue in a simple way. I just had to install Mono development libraries. The commands were the following (for Ubuntu 18.04):
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu stable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update
sudo apt-get install mono-devel
So, happy hacking ensued, and I finally got on with my project, with IntelliSense helping along the way!
Koodia 