Why don't any of these methods work for installing .Net Core SDK & runtime on 22.04 (Jammy Jellyfish)?

Question

I went to the following official Microsoft link to install .NET Core 6.x (SDK & runtime) and they would not work.

Basically, it tells you to :

wget https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb

Then to install SDK you are supposed to run:

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

Then to install runtime it says to run:

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

But when I ran all of that, I got a weird thing where the runtime was "half installed".

I could run $ dotnet --list-sdks and it wouldn't report any SDK.

Also, I couldn't run the simple command $ dotnet --version It would state that no SDKs were installed and the command couldn't run. Very confusing.

I also got an error like:

Unable to locate package dotnet-sdk-6.0

Microsoft says to choose the following link to resolve that: APT troubleshooting section.

Tried Snap I also tried installing the snap. Again, dotnet runtime still didn't work properly. I tried various removing and rebooting and many options but could never get the SDK installed properly.

Answer 1

I make it run with the APT package solution, in fact there is a conflict between Ubuntu packages (Jammy feed) and Microsoft Package (PMC), more info here: https://github.com/dotnet/core/issues/7699

The solution with the following steps works for me: Use .NET 6 Package via PMC

1. Remove all .NET packages

sudo apt remove 'dotnet*'
sudo apt remove 'aspnetcore*'

2. Create the file:

sudo touch /etc/apt/preferences.d/dotnet.pref

with content:

Package: *
Pin: origin "packages.microsoft.com"
Pin-Priority: 1001

3. Install .NET SDK 6.0

sudo apt update
sudo apt install dotnet-sdk-6.0

And I got the last version of the SDK:

$ dotnet --list-sdks
6.0.400 [/usr/share/dotnet/sdk]

Answer 2

Only Manual Install Works

I finally installed .NET Core 6.x SDK & runtime manually, by following the steps at: https://docs.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#manual-install

I downloaded .NET Core 6.x SDK & runtime tar gz.

Next, I opened a terminal and I ran each of the following, one at a time:

$ DOTNET_FILE=dotnet-sdk-6.0.400-linux-x64.tar.gz
$ export DOTNET_ROOT=$(pwd)/.dotnet
$ mkdir -p "$DOTNET_ROOT" && tar zxf "$DOTNET_FILE" -C "$DOTNET_ROOT"
$ export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools

Right after I did that I was able to run:

$ dotnet --version and I saw the appropriate output: 6.0.400

Next, I tried listing the SDKS:

$ dotnet --list-sdks and I saw: 6.0.400 [/home/raddev/Downloads/.dotnet/sdk]

I built a sample program and ran it and now everything works.

It seems you have to manually do this install.

After that I had to edit my ~/.bashrc and add the two following lines as the last two lines, so that appropriate folders would always be available via path.

export PATH=$PATH:$HOME/.dotnet
export DOTNET_ROOT=$HOME/.dotnet

Update (2022-08-16)

This article was just released today: Microsoft and Canonical announce native .NET availability in Ubuntu 22.04 hosts and containers -- Sub-title Install .NET 6 with one apt install command.

Here's the main point:

Answer 3

The following simple command has fixed the problem for me:

sudo apt dist-upgrade