At some point my dotnet started to give me an error "Error: [/usr/share/dotnet/host/fxr] does not exist". Problem is that Ubuntu has dotnet in there repositories and if you install the Microsoft repositories at "/etc/apt/sources.list.d/microsoft-prod.list" then there is conflicting packages. And with updates the dotnet break with the error.
On my side I can't remove the Microsoft repositories at "/etc/apt/sources.list.d/microsoft-prod.list" because I install sql server tools as well.
From solutions found I had to do the following.
1. Remove the dotnet packages with the following command
sudo apt remove dotnet* aspnetcore* netstandard*2. Create a file "99microsoft-dotnet.pref" in folder "/etc/apt/preferences.d" to tell apt to use the Microsoft packages instead of the Ubuntu packages. Put the following content in the file.
Package: *
Pin: origin "packages.microsoft.com"
Pin-Priority: 1001
3. Then install the dotnet packages again. (You can change the dotnet version to the required version.
sudo apt update && sudo apt install -y dotnet-sdk-6.04. For me after a period my dotnet broke again. On research I found that unattended apt upgrade do not use the Microsoft packages and then the Ubuntu versions was installed again. So to fix unattended upgrades I had to change the following file "/etc/apt/apt.conf.d/50unattended-upgrades" and add the following to the "Unattended-Upgrade::Package-Blacklist" part.
Unattended-Upgrade::Package-Blacklist
{
"dotnet.*";
"aspnetcore.*";
};Hope this helps
References:
https://stackoverflow.com/questions/73753672/a-fatal-error-occurred-the-folder-usr-share-dotnet-host-fxr-does-not-exist
https://github.com/dotnet/core/issues/7699#issuecomment-1780733437