DebugPoint published a tutorial about upgrading to Ubuntu 22.04 from Ubuntu 20.04 LTS.
How to Upgrade to Ubuntu 22.04 LTS From Ubuntu 20.04 LTS
Complete steps to upgrade to Ubuntu 22.04 LTS "Jammy Jellyfish" from Ubuntu 20.04 LTS and Ubuntu 21.10 with additional instructions.
How to Upgrade to Ubuntu 22.04 LTS From Ubuntu 20.04 LTS