I have a RockPi4 (ARM64) running Ubuntu 18.04. I want to perform a full system encryption with automatic decryption at boot. However, I could not find any resource that fits to my needs. What it the correct procedure to do it?

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    You'll have to reinstall, and choose an encrypted install. The conversion path from an unencrypted system to an encrypted one is long, confusing, and unlikely to succeed – waltinator May 16 at 13:25

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