This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots -import -sync). Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. The package mono-xsp4 should be installed for running ASP.NET applications.Īfter the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly. Install this package if you run into trouble making HTTPS connections. The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. NETPortable' errors during software compilation. The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed. The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.

The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors. The package mono-devel should be installed to compile code.

Sudo apt install apt-transport-https ca-certificatesĮcho 'deb stable-xenial main' | sudo tee /etc/apt//mono-official-stable.list Sudo apt update Ubuntu 18.04 (i386, amd64, armhf, arm64, ppc64el) sudo apt install ca-certificates gnupgĮcho 'deb stable-bionic main' | sudo tee /etc/apt//mono-official-stable.list Sudo gpg -homedir /tmp -no-default-keyring -keyring /usr/share/keyrings/mono-official-archive-keyring.gpg -keyserver hkp://:80 -recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EFĮcho 'deb stable-focal main' | sudo tee /etc/apt//mono-official-stable.list Ubuntu 20.04 (amd64, armhf, arm64, ppc64el) sudo apt install ca-certificates gnupg Note: the packages should work on newer Ubuntu versions too but we only test the ones listed below. The package repository hosts the packages you need, add it with the following commands.

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