.NET Core is a new FOSS software framework from Microsoft for C#, Visual Basic, and F#. It is designed to be cross-platform, modular and apt for modern applications, as opposed to its predecessor, the .NET Framework.
If you only want to run .NET Core managed applications, install the package.
To build apps with .NET Core, installas well.
PATH, otherwise dotnet tools will not work from shell.
Install multiple versions
You can install multiple versions of the .NET Core SDK or runtime side by side by using the dotnet-install.sh script provided by the .NET Foundation. You can find the documentation of the script here.
For instance, this command would install the latest version found in the "current" channel in
# ./dotnet-install.sh --install-dir /opt/dotnet -channel Current -version latest
You may want to simulate the installation first by using the
Once installed, you can verify the SDKs available:
$ dotnet --list-sdks 2.2.108 [/opt/dotnet/sdk] 3.0.100 [/opt/dotnet/sdk] $ dotnet --version 3.0.100
Telemetry is enabled by default but can be disabled by setting environment variable
"the required library libhostfxr.so could not be found" error
Some of the dotnet SDK tools (for example libman, dotnet-watch etc.) may expect you to have the environment variable
DOTNET_ROOT pre-configured. If it's not, an error like this one could be observed: 
A fatal error occurred, the required library libhostfxr.so could not be found. If this is a self-contained application, that library should exist in [/home/my_user/.dotnet/tools/.store/microsoft.web.librarymanager.cli/1.0.172/microsoft.web.librarymanager.cli/1.0.172/tools/netcoreapp2.1/any/]. If this is a framework-dependent application, install the runtime in the default location [/usr/share/dotnet] or use the DOTNET_ROOT environment variable to specify the runtime location.
The workaround is to manually export
DOTNET_ROOT in your shell:
SDK specified could not be found
This is believed to caused by a conflict between the Mono and MSBuild SDK libs and the dotnet core ones. To fix this export the path manually in your shell (replacing the version number as necessary) e.g: