Today I came across this problem while trying to use dotnet core on my Ubuntu 22.04.2 system.

The below message was displayed when running dotnet commands like dotnet new and dotnet run.

A fatal error occurred. The folder [/usr/share/dotnet/host/fxr] does not exist.

This problem seems to be potentially related to the different packages provided by the Ubuntu feed and the Microsoft feed, more info on that over here

To fix this I followed the below steps…

  1. Remove all your current dotnet installations using
    sudo apt remove 'dotnet*' 'aspnet*' 'netstandard*'
  2. If it doesn’t already exist create the following
    touch /etc/apt/preferences
  3. Open /etc/apt/preferences with a text editor and add the below
Package: dotnet* aspnet* netstandard*
Pin: origin "packages.microsoft.com"
Pin-Priority: -10
  1. Install dotnet following the steps here

Hopefully that solves it for you!

Health ❤️ ❤️ ❤️ ❤️ ❤️

See you soon 🗡️