Disable Encryption

[bujiraso]

https://wiki.pine64.org/index.php/PinePh...ng_Systems

Does this link contain the information that is being requested?

I'll contribute a thought -- FDE means the whole partition is encrypted so decrypting it may not be possible without quite a bit of manual effort.
While I know Bitlocker can in-place encrypt and decrypt on Windows, I don't know how this works and haven't seen the same thing on Linux. For reference, I have had FDE on all my Arch boxes for a decade and am not aware of any easy method.
A quick google shows that people agree on Ask Ubuntu.

Likely the easiest path here is backing up your items somewhere and starting a-fresh. There's a utility to easily flash on this post