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You probably need to do this with a live system (not using a system that is on the partition you want to rename)
Changing the label should also work during operation.
For example, it should be sufficient to run sudo btrfs filesystem label / newlabel to change the label of the root partition (/) to newlabel.
If I'm not mistaken (can't test it right now), you have to specify the mountpoint when the partition is mounted. And in unmounted state the device (e.g. /dev/sda).
sudo btrfs filesystem label
I did do just that to no avail. No error message either. I managed to find this however:
"btrfs filesystem show" works. I do not know what "lsblk requires a udevadm trigger" means but I'll look into it
this post was submitted on 29 Jun 2023
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