Hi everybody! Welcome to this LHC@home tutorial for Linux users. If you use Windows or Mac you will find the installation steps on the same website. My name is Karolina. I am a student in the IT Department at CERN. Today, I would like to show how you can support scientists in their quest for a better understanding of our universe just by offering the spare power of your processor. For this purpose we are going to use BOINC, which is a program that uses your computer to solve scientific problems. BOINC allows you to access many different volunteering cloud computing projects from all around the world, some of them help scientists working at Large Hadron Collider. At the end of this tutorial you will be able to run computational tasks for one of the LHC projects. To begin we go to LHC@home website and choose the JOIN US tab. ***First thing (1.)*** we are told to do is to install the BOINC program. There are several ways to do this, but I recommend to install BOINC as a system package. Open your terminal and type the command according to your Linux distribution. ("Show the html page") Note that you need to have the superuser privilege to do so. For debian/ubuntu this command ("point the command") installs both the boinc_client which is the BOINC client program runnning jobs and the boinc_manager which is a graphical user interface to manage BOINC. For Fedora/centos/SC you need to install the boinc_client and the boinc_manager separately ("point the command"). If your distribution of Linux doesn't provide a package for BOINC or you are not sure if it is the most recent one, download the shell script that you will find after you click the button below. Then run the commands listed here ("show html page: point the commands".) If you are using testing distribution you might have to install BOINC from source, which you can find on the official boinc berkley's site ("show html page to show the link"). After installation the boinc-client should start when the machine reboots. More information you will find here ("show html page to show the link"). Now you should be able to run the boinc client and the boincmgr, but you are not yet running a project. To change that, go to the LHC@home website where under the "Projects" tab you can find the list of projects related to CERN. There you can read more about the purposes of each project and you can choose the one that interests you most. ***Then (2.)*** go to the BOINC site of the project, choose "log in", create an account and fill out a form. With BOINC you can run several projects at the same time, so I encourage you to sign-up for a few of them. By now you should have BOINC installed on your computer and be a member of at least one project. ***What's more (3.)*** you need to check if your project needs any additional programs. For most of the LHC@home projects you need VirtualBox. As we did before, we are using system package so we are just typing "sudo apt-get install virtualbox" or yum depending on your distribution. To run VirtualBox you need the virtualization technology enabled on your computer. Consult on VirtualBox webpage if you have any issues. When you have VirtualBox installed you have all the necessary tools to run projects under BOINC. ***The one last step(4.)*** is to connect your project account and BOINC. You can do that from the boinc manager. Start the boinc manager ("in that point I will show it on terminal"). It pops out a window where you can choose project, find the one that you created the account for ("vlhcathome"), click next, agree for a terms of use, choose existing user and give the same email and password as you provided when you created an account for project. Voila, BOINC should be now up and running. If you open the BOINC manager you should see tasks related to the project that you chose. From within the boinc-manager you can also add new projects and manage the ones you are in. You can, for example, limit the CPU, memory, disk or network usage according to your preferences. Many options can also be changed on the project's webpage under your account. Thank you for following this tutorial and I hope BOINC is now up and running for you. If you want to know more about different BOINC options go to the official webpage ("show in the browser"), where you should find the information you need. We will also be very happy to assist you on the project forum.