I get an umount failed for oldroot on shutdown error.
I have used several disk tool mount/gpart/fdisk/df etc to search for the /oldroot and I believe it is never mounted and does not exist.
However, when I shutdown I get umount failed error for this disk. The error is not causing a problem and I read on the web that it is normal.
What is oldroot and why does Ubuntu think it is mounted?
Is this real failure or a "normal" shutdown error?
I don't always get this error but cannot determine why it will shutdown sometimes without errors. Any ideas?
Finally, question 1 is the most important question to me and I cannot find the answer on the internet.
Configuration 18.10, encrypted disk, nothing special, just barebone laptop.
