Let’s Encrypt is hot stuff – you can use it for free and automagically renewing certs, but, I still buy my own certs. That means that I get to renew my certs, every year. I’m mostly in Microsoft camp, so all of my cert reissuing I also did on Windows Server mostly. But times have changed, I do this also on Linux now (Ubuntu) and in this guide I would like to show you how to do generate csr and reissue a cert on Ubuntu.