Hi,
in our company, I am the new Jira admin. Our Jira 8.13 is running on an Ubuntu. As Jira and Ubuntu are some versions behind, we would like to upgrade both (-> security and feature updates). What is the correct procedure? Would you do the steps in the following order?
Is there an official documentation for this? What is best practice?
Your list appears to be in the correct order.
For more details, here's a guide from Atlassian: https://confluence.atlassian.com/adminjiraserver/upgrading-jira-applications-938846936.html