Currently have the .net sdk 3.1.404 installed. There is a newer version out Download .NET Core 3.1 SDK 3.1.405.

I am trying to figure out how to upgrade this on my machine. Part of my problem is that all the documentation is on how to install .net 5.0 which is not what i need currently i need the latest SDK for 3.1 in the project i am working on.

Currently installed versions:

linda@linda-ThinkPad-X1-Extreme-2nd:~/development/$ dotnet --list-sdks

2.2.402 [/usr/share/dotnet/sdk]

3.1.404 [/usr/share/dotnet/sdk]

5.0.101 [/usr/share/dotnet/sdk]

I tried running:

sudo apt-get update; 

  sudo apt-get install -y apt-transport-https && 

  sudo apt-get update && 

  sudo apt-get install -y dotnet-sdk-3.1.405

Which resulted in:

E: Unable to locate package dotnet-sdk-3.1.405

E: Couldn't find any package by glob 'dotnet-sdk-3.1.405'
E: Couldn't find any package by regex 'dotnet-sdk-3.1.405'

Then I tried:

sudo apt-get install dotnet-sdk-3.1

Which then resulted in the following message:

dotnet-sdk-3.1 is already the newest version (3.1.404-1).

As you can see I am a little new at running Linux for my development desktop any help would be greatly appreciated.

My current Ubuntu version is:

Distributor ID: Ubuntu

Description:    Ubuntu 20.04.1 LTS

Release:    20.04

Codename:   focal