Is there a tutorial / would it be possible for the Nitrokey team to write a tutorial about using Nitrokey Pro or Nitrokey FIDO 2 for securing Ubuntu 20.04, both full disk encryption with hardware token for decryption, and 2-factor login with password + token? If this already exists, can you point to the resource? There are many tutorials online but often a bit unpolished / hard to follow, I think it would be very useful to have an ‘official nitrokey tutorial’.
You will find documents related to FIDO 2 on Linux here, including Ubuntu, and it covers 2FA using a security key.
You can find here the documents related to the Nitrokey Pro 2, on Linux. In general terms similar documentation is available at the root URL. For the specific instructions of full disk encryption, you will find the instructions here, with Veracrypt, LUKS/dm-crypt or EncFS.
I hope this covers the topics in your question. Feedback is always welcome, so feel free to suggest tutorials to create.