Unable to install dotnet-sdk-3.1 on Raspberry Pi running Ubuntu 18.04.4 LTS

[ParamOza]

While trying to install the dotnet SDK onto my RasPi, I keep getting a 404 on the Microsoft Ubuntu packages repo. I can see the dotnet-sdk-3.1 package when I run apt search dotnet-sdk but I keep getting a "Unable to locate package dotnet-sdk-3.1" error when I try to run sudo apt-get install dotnet-sdk-3.1. Here is exactly what happens:

ubuntu@ubuntu:~$ sudo apt-get install dotnet-sdk-3.1 Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package dotnet-sdk-3.1 E: Couldn't find any package by glob 'dotnet-sdk-3.1' E: Couldn't find any package by regex 'dotnet-sdk-3.1'

[scalablecory]

@dagood @leecow

[dagood]

Raspberry Pis run on ARM architectures, not x64, so you need to follow these instructions (source) to install using binaries instead of using the apt feed:

Package manager installs are only supported on the x64 architecture. Other architectures, such as ARM, must manually install the .NET Core SDK or manually install the .NET Core Runtime.

[dagood]

We are looking at creating deb packages for ARM and ARM64, tracked here:
dotnet/runtime#3263
dotnet/runtime#3298
Until then, you have to use the alternatives.