[Bug 68362] No explanation when Disks Manager cannot unmount

[kripkenstein]

Public bug reported:

Binary package hint: gnome-system-tools

When trying to disable (unmount) a partition in Disks Manager, if the
unmount fails, then nothing happens - no explanation, no error. Just a
screen redraw for the window.

For example, if some process is using the partition, then an unmount
should fail (umount would return "device is busy" on the command line).
Try to disable the partition in Disks manager, and nothing happens, no
error is reported.

It would be nice if Disks Manager reported that the operation failed,
even if all it gave is the umount output. Even better would be some
smart output, e.g. the process that is using the partition, for example
"fuser -m /dev/sda2" can say which process number is using sda2. Then
the command that started the process would be nice to know, for someone
trying and failing to unmount that partition.

** Affects: gnome-system-tools (Ubuntu)
     Importance: Wishlist
     Assignee: Ubuntu Desktop Bugs
         Status: Rejected

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No explanation when Disks Manager cannot unmount
https://launchpad.net/bugs/68362