this post was submitted on 01 Jun 2024
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I tried the following

sudo cryptsetup luksChangekey /dev/nvme0n1p3 < new passphrase > 

It then asks for the Sudo password, then asks for the old passphrase, but then it prints this error message

Failed to open key file.

what went wrong ?

Edit: turns out using GNOME Disks is way more straightforward.. ๐Ÿ˜…, thank you all

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[โ€“] [email protected] 5 points 5 months ago

Refer to the cryptsetup-luksChangeKey man page --key-file options, you cannot change the password directly on a commandline; you either (a) type it interactively, (b) put it in a keyfile, or (c) accept input from STDIN with the standard use of - on the end (e.g. echo "mypass" | cryptsetup luksChangeKey /dev/sda - )

[โ€“] [email protected] 2 points 5 months ago (1 children)

Have you tried using GNOME Disk Utility?

[โ€“] [email protected] 1 points 5 months ago (2 children)

I have it installed, but I don't see the option ๐Ÿคทโ€โ™‚๏ธ

[โ€“] [email protected] 2 points 5 months ago

Try clicking on the encrypted partition to get the passphrase option.

https://askubuntu.com/questions/95137/how-to-change-luks-passphrase

[โ€“] [email protected] 1 points 5 months ago (1 children)
[โ€“] [email protected] 2 points 5 months ago

OMG, thank youu.. It worked.. ๐Ÿฅณ