Installed .NET 6.0 SDKs not showing with dotnet --info or dotnet --list-sdks and commands depeding on SDK fail (Linux/Ubuntu)

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

[Ubuntu] After upgrade to latest dotnet sdk stopped working. Clean reinstall of latest version doesn’t help.

dotnet-sdk-6.0/jammy,now 6.0.400-1 amd64 [installed]

dotnet --info output:

global.json file:
  Not found

Host:
  Version:      6.0.8
  Architecture: x64
  Commit:       55fb7ef977

.NET SDKs installed:
  No SDKs were found.

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.8 [/usr/lib/dotnet/dotnet6-6.0.108/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.8 [/usr/lib/dotnet/dotnet6-6.0.108/shared/Microsoft.NETCore.App]

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

Learn about .NET Runtimes and SDKs:
  https://aka.ms/dotnet/runtimes-sdk-info

dotnet tools list

  * You intended to execute a .NET application:
      The application 'tools' does not exist.
  * You intended to execute a .NET SDK command:
      No .NET SDKs were found.

Download a .NET SDK:
https://aka.ms/dotnet-download

Learn about SDK resolution:
https://aka.ms/dotnet/sdk-not-found

Expected Behavior

dotnet SDK expected to be working after install or upgrade

Steps To Reproduce

Installed according to instruction for the ubuntu 22.04: https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#2204

Exceptions (if any)

No response

.NET Version

The command could not be loaded, possibly because: * You intended to execute a .NET application: The application ‘–version’ does not exist. * You intended to execute a .NET SDK command: No .NET SDKs were found. Download a .NET SDK: https://aka.ms/dotnet-download Learn about SDK resolution: https://aka.ms/dotnet/sdk-not-found

Anything else?

dotnet-sdk-6.0/jammy,now 6.0.400-1 amd64 [installed]

[olfek]

I have a fix !

1. Run sudo apt remove --purge --autoremove *dotnet*

2. create or modify /etc/apt/preferences and add (you’ll need sudo)

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

   Run man apt_preferences for more info about this config.

3. Run sudo apt install dotnet-sdk-6.0

4. Enjoy !

---

Output of cat /etc/*release:

DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=21
DISTRIB_CODENAME=vanessa
DISTRIB_DESCRIPTION="Linux Mint 21 Vanessa"
NAME="Linux Mint"
VERSION="21 (Vanessa)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 21"
VERSION_ID="21"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=vanessa
UBUNTU_CODENAME=jammy

[kitingChris]

Don’t use /etc/apt/preferences. Create a new file in /etc/apt/preferences.d instead!

sudo nano /etc/apt/preferences.d/dotnet

With content:

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

and

sudo nano /etc/apt/preferences.d/aspnet

With content:

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

EDIT: Or more easy with heredoc:

sudo sh -c "cat > /etc/apt/preferences.d/dotnet <<'EOF'
Package: dotnet*
Pin: origin packages.microsoft.com
Pin-Priority: 1001
EOF"
sudo sh -c "cat > /etc/apt/preferences.d/aspnet <<'EOF'
Package: aspnet*
Pin: origin packages.microsoft.com
Pin-Priority: 1001
EOF"