$ curl -O -L -s https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb
$ sudo dpkg -i packages-microsoft-prod.deb
$ sudo apt update && sudo apt install -y apt-transport-https
$ apt search aspnetcore-runtime.*
$ sudo apt install dotnet-sdk-5.0
$ dotnet --version > 5.0.402
$ dotnet --list-sdks > 5.0.402 [/usr/share/dotnet/sdk]
$ dotnet --list-runtimes
> Microsoft.AspNetCore.App 5.0.11 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
> Microsoft.NETCore.App 5.0.11 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
$ sudo apt install dotnet-sdk-3.1
$ dotnet --list-sdks
> 3.1.414 [/usr/share/dotnet/sdk]
> 5.0.402 [/usr/share/dotnet/sdk]
> Microsoft.AspNetCore.App 3.1.20 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
> Microsoft.AspNetCore.App 5.0.11 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
> Microsoft.NETCore.App 3.1.20 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
> Microsoft.NETCore.App 5.0.11 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
$ sdrsharp
[URL]