With the Ubuntu 20.04 LTS (Focal Fossa) release out the door, many users will consider upgrading their systems from a either Ubuntu 18.04 LTS (Bionic Beaver) or Ubuntu 19.10 (Eoan Ermine).

Source: LXer – How to Upgrade Ubuntu 18.04 LTS or 19.10 to Ubuntu 20.04 LTS “Focal Fossa”