There are two main variants of the you might encounter:
Use balenaEtcher . It’s a simple "Select File > Select Drive > Flash" process. ubuntu 20.04 64 bits iso
Note that Canonical typically delays in-place upgrades until the first point release of the new LTS (e.g., 22.04.1). You can force it earlier with the -d flag, but that is not recommended for production systems. There are two main variants of the you