Develop .NET Core for Ubuntu 18.04 https://dotnet.microsoft.com/download/linux-package-manager/ubuntu18-04/sdk-2.1.301 $ wget -q https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb $ sudo dpkg -i packages-microsoft-prod.deb Install the .NET SDK $ sudo add-apt-repository universe $ sudo apt-get install apt-transport-https $ sudo apt-get update $ sudo apt-get install dotnet-sdk-2.1 If you receive an error message similar to Unable to locate package dotnet-sdk-2.1, run the following commands. $ sudo dpkg --purge packages-microsoft-prod && sudo dpkg -i packages-microsoft-prod.deb $ sudo apt-get update $ sudo apt-get install dotnet-sdk-2.1 If that doesn't work, you can run a manual install with the following commands $ sudo apt-get install -y gpg $ wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.asc.gpg $ sudo mv microsoft.asc.gpg /etc/apt/trusted.gpg.d/ $ wget -q https://packages.microsoft.com/config/ubuntu/18.04/prod.list $ sudo mv prod.list /etc/apt/sources.list.d/microsoft-prod.list $ sudo chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg $ sudo chown root:root /etc/apt/sources.list.d/microsoft-prod.list $ sudo apt-get install -y apt-transport-https $ sudo apt-get update $ sudo apt-get install dotnet-sdk-2.1 .NET Core for Ubuntu 18.10 https://dotnet.microsoft.com/download/linux-package-manager/ubuntu18-10/sdk-2.1.301 $ wget -q https://packages.microsoft.com/config/ubuntu/18.10/packages-microsoft-prod.deb $ sudo dpkg -i packages-microsoft-prod.deb Install the .NET SDK $ sudo apt-get install apt-transport-https $ sudo apt-get update $ sudo apt-get install dotnet-sdk-2.1 $ sudo apt install gtk-sharp2 $ sudo apt install glib-sharp -- Unable to locate package $ sudo apt install pango-sharp -- Unable to locate package $ sudo apt install atk-sharp -- Unable to locate package $ sudo apt install gdk-sharp -- Unable to locate package $ sudo apt install glade-sharp -- Unable to locate package $ sudo apt install art-sharp -- Unable to locate package $ sudo apt install rsvg-sharp -- Unable to locate package $ sudo apt install gtk-dotnet -- Unable to locate package $ sudo apt install gnome-sharp -- Unable to locate package $ sudo apt install gnomevfs-sharp -- Unable to locate package $ sudo apt install vte-sharp -- Unable to locate package $ sudo apt install gconf-sharp -- Unable to locate package $ sudo apt install gtkhtml-sharp -- Unable to locate package $ sudo apt-get install glade $ sudo apt-get install libglade2.0-cil libglade2.0-cil-dev $ sudo apt install libcanberra-gtk-module libcanberra-gtk3-module