.NET 8 SDK stopped building projects in Linux: `You must install or update .NET to run this application`

[eduherminio]

Describe the bug

I had .NET SDK 8 installed in an Ubuntu Azure VM and it was building my project just fine every hour/few hours or so until earlier today,

Suddenly stopped being able to do so, stating You must install or update .NET to run this application. and No frameworks were found. No reboots or known changes happened in the VM (the builds are part of an automated process that doesn't restart automatically after VM restart) and no changes happened in the code either.

Is this somehow expected?

To Reproduce

Exceptions (if any)

~$ dotnet publish src/Lynx.Cli/Lynx.Cli.csproj -c Release --runtime linux-x64 --self-contained /p:Optimized=true /p:DeterministicBuild=true /p:ExecutableName=lynx-E8A394A1 -o ./
You must install or update .NET to run this application.

App: /usr/share/dotnet/sdk/8.0.200/dotnet.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.2' (x64)
.NET location: /usr/share/dotnet/

No frameworks were found.

Learn more:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=8.0.2&arch=x64&rid=linux-x64&os=ubuntu.22.04

I don't think it matters, but the repo being built was lynx-chess/Lynx.

Further technical details

System: Linux 6.2.0-1018-azure

~$ dotnet --info
You must install or update .NET to run this application.

App: /usr/share/dotnet/sdk/8.0.100/dotnet.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.0' (x64)
.NET location: /usr/share/dotnet/

No frameworks were found.

Learn more:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=8.0.0&arch=x64&rid=linux-x64&os=ubuntu.22.04

Host:
  Version:      8.0.0
  Architecture: x64
  Commit:       5535e31a71
  RID:          linux-x64

.NET SDKs installed:
  8.0.100 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  No runtimes were found.

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[GaNacereddine]

I have the same error, 4 VMs stoped working all at the same time

[appiclogics]

Anyone looking for fix:

1. Downgrade sdk:

sudo apt-get install --allow-downgrades dotnet-sdk-8.0=8.0.100-1

2. Reinstall sdk and runtime should fix it

sudo apt-get update && \
  sudo apt-get install -y dotnet-sdk-8.0

sudo apt-get install -y dotnet-runtime-8.0

[Ariex]

many thanks to @appiclogics !!
similar thing happen to me today in vultr vm, site was running fine, after a commit been pushed to the server, which then publish & restart server, it ends with error. when type dotnet --version it only say this:

You must install or update .NET to run this application.

App: /usr/share/dotnet/sdk/8.0.200/dotnet.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.2' (x64)
.NET location: /usr/share/dotnet/

No frameworks were found.

Learn more:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=8.0.2&arch=x64&rid=linux-x64&os=ubuntu.22.04

[banmohan]

Same error happened, is anyone have fixed it?

[GaNacereddine]

So for every one having this issue, the problem is that our VM/Machines have aspnetcore-runtime-8.0 package installed but what is needed is this dotnet-runtime-8.0 package
all you have to do is update apt and install the missing package
no need to down grade

[tmds]

the problem is that our VM/Machines have aspnetcore-runtime-8.0 package installed but what is needed is this dotnet-runtime-8.0 package

When the aspnetcore-runtime-8.0 package is installed, that should mean the dotnet-runtime-8.0 package gets installed as well (as a dependency), see https://learn.microsoft.com/en-us/dotnet/core/distribution-packaging.

cc @MichaelSimons

[GaNacereddine]

It all depends on how you installed your runtime in the first place.
in my case, after some investigation, I found out that the dotnet-runtime-8.0 package is not installed in all VMs only the aspnetcore-runtime-8.0 package is.
How it happened, I do not know and I simply do not care, I just added another line in my Python setup script and was done with it.

anyway that is much better than downgrading to 8.0.1

[tmds]

It all depends on how you installed your runtime in the first place.

Unless you're doing something unusual, dotnet-runtime-8.0 should auto install as a dependency of aspnetcore-runtime-8.0.
If it doesn't, then the aspnetcore-runtime-8.0 package is not expressing this dependency.

[MichaelSimons]

cc @NikolaMilosavljevic - Can you take a look?

[NikolaMilosavljevic]

aspnetcore-runtime-8.0 package has a dependency on dotnet-runtime-8.0 package - here's the output of rpm -qpR command:

warning: aspnetcore-runtime-8.0-8.0.2-1.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 3135ce90: NOKEY
dotnet-runtime-8.0 >= 8.0.2
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1

@eduherminio @GaNacereddine can you add more specifics about VMs you're using, i.e. how do you create and set them up, etc? It would help reproduce this locally and fix the issue.

[NikolaMilosavljevic]

DEB packages are the same - there is a runtime dependency:

 Depends: dotnet-runtime-8.0 (>= 8.0.2)

Are these VMs runing the same distro? I see that first issue was reported on Ubuntu, presumably 22.04.

[eduherminio]

@eduherminio @GaNacereddine can you add more specifics about VMs you're using, i.e. how do you create and set them up, etc? It would help reproduce this locally and fix the issue.

$ uname -srm
Linux 6.2.0-1019-azure x86_64

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.3 LTS
Release:        22.04
Codename:       jammy

Created manually from Azure Portal.
Setup done by running:

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
sudo apt-get update && sudo apt-get install -y dotnet-sdk-8.0

Let me know if any other information could be helpful

[dkackman]

I can repro this on WSL Jammy. Code that runs from VSCode debugger fails at the command line.

Architecture: x64
App host version: 8.0.2
.NET location: Not found

Learn more:
https://aka.ms/dotnet/app-launch-failed

Download the .NET runtime:
https://aka.ms/dotnet-core-applaunch?missing_runtime=true&arch=x64&rid=linux-x64&os=ubuntu.22.04&apphost_version=8.0.2

dotnet --list-runtimes
Microsoft.AspNetCore.App 8.0.2 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

dotnet --list-sdks
8.0.200 [/usr/share/dotnet/sdk]