check:

https://learn.microsoft.com/es-es/dotnet/core/install/linux-ubuntu

# add repo

wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb

sudo dpkg -i packages-microsoft-prod.deb

rm packages-microsoft-prod.deb

​

# install runtime

sudo apt update && apt install -y aspnetcore-runtime-6.0

sudo apt update && apt install -y aspnetcore-runtime-7.0

​

# install sdk

sudo apt update && apt install -y dotnet-sdk-6.0

sudo apt update && apt install -y dotnet-sdk-7.0

​

# check installation

dotnet --list-runtimes

dotnet --list-sdks