I have noticed that when I reboot Bluefin, an error message flashes on the console for less than a second and then vanishes. Nothing is reported in the journal that I can see.
Any ideas?
It’s probably nothing to worry about.
The Linux kernel and the operating system support a ton of hardware and configurations. There can be errors if something you don’t use isn’t present, or isn’t configured.
Similarly, when shutting down, the kernel might be waiting for something that is no longer running, give up, and print an error.
If you’re really concerned, you can record a video with your phone, then step through it to see what the messages were.
After taking a video the message is:
[FAILED] Failed unmounting var-mnt-data.mount - /var/mnt/data
Are you using a secondary drive mounted there?
Yes. It’s an 8TB SSD.
Here’s the entry in /etc/fstab:
/dev/disk/by-uuid/47ab588d-665a-46f4-9521-dc61cf242ff4 /mnt/data btrfs nosuid,nodev,nofail 0 0