[Bug 91854] Depends on the hardware

[Nicolas_Raoul]

The same happens with my external hard drive under "/media/disk"
On the contrary, two different USB keys mouting on "/media/disk" generate no such error.

I checked that by mounting and unmouting them many times in different
order, always the same.

More info upon request.
Nicolas.

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Cannot unmount volume: Cannot remove directory
https://launchpad.net/bugs/91854