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Each time I reboot my laptop, that's running Kubuntu 20.04, I see this message right before it reluctantly reboots:
systemd-shutdown[1]: Failed to finalize DM devices, ignoring
Also, rebooting takes longer than it should while this message is being displayed.
I've found a bunch of people asking about this, but I haven't yet read one solid answer.
What does this message really mean, and how can I fix this "failure"? The goal is to have no unnecessary delays when I initiate a reboot.
I'm not sure about the delay you are experiencing, but the message systemd-shutdown[1]: Failed to finalize DM devices, ignoring may suggest that your root filesystem is on a LVM device and because of that systemd cannot detach it. So you can safely ignore that message.
Take a look at https://github.com/systemd/systemd/issues/15004. There is a mention about a delay in the shutdown too, but it would be necessary more detailed logs to know what's going on.
