this post was submitted on 05 Jul 2025
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OP, I would seriously consider trying the Arch Wiki for this. I really hope you had a backup, but you probably need expert-level advice here (at least below "paid data recovery specialist") if you have any hope of unfucking this. Obviously you've learned your lesson about running random commands you don't understand in response to an error message, so I don't think people should be scolding you for that.
The command had the --decrypt option so I thought that would make it decrypt.
I was following step 1.3 here, in trying to "decrypting LUKS2 devices in-place."
https://wiki.archlinux.org/title/Removing_system_encryption
This seems reasonable. And you're right.
But there is absolutely no way that interrupting such an operation with a forced power-cycle can be safe. In fact it's an almost guaranteed way to put a data partition into a irrecoverable state.
When it comes to storage operations, you either let them fail, or complete. Interrupting file system modifications is a HUGE no-no.