Heitor,

I thought I was crossing some etiquette boundary and being ignored (snubbed!) 
and was hesitant to comment further!!! Regardless, some caution as you are 
testing the memory of a 70 year old who is taking bad (perscription) drugs that 
**** up my memory (yes I am still sick after 5 years - it sucks).
That said I believe grub-mount has access to the full running linux system of 
filesystems, but grub-probe (intentionally) doesn't.

In the two cases I discovered thin-lvms and thick lvm snapshots, both
were mountable by grub-mount and grub-probe failed (i.e. returned an
error code).

As I wrote at the beginning of the bug report, when I fixed the bug as
you have I discovered that the thin-lvm was ignored, but the thick
snapshot was added to the cfg file, but as the base by one of the
"mounted" probes". This results in the really bad situation that all
will work until the user tries to update grub or the cfg file in the
thick snapshot as it will have no effect and I expect the user will have
a really hard time figuring it out.

My latest suggestion may not be perfect, but it makes things better
(never leaves a file system mounted - even if it is because of user
error) and never makes it worse.

Perhaps juliank can provide better insight on grub-mount vs grub-probe.

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https://bugs.launchpad.net/bugs/1987679

Title:
  os-prober leaves filesystems (lvm-thin, lvm snap) mounted

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