On Ubuntu, you can easily set up dotnet using snap. (https://learn.microsoft.com/en-us/dotnet/core/install/linux-snap).
sudo snap install dotnet-sdk --classic
sudo snap alias dotnet-sdk.dotnet dotnet
However, when you open a newly created project with vscode, you may get the error of complaining the SDK not being found.
It looks like this is due to the dotnet executable not being found at a location vscode is expected. To overcome this, you simple create a symbolic link of the dotnet executable at /usr/local/bin (ref: https://github.com/dotnet/vscode-csharp/issues/3077)
cd /usr/local/bin
sudo ln -sv /snap/dotnet-sdk/current/dotnet .
