Attempt to unmount target before stopping with error message #24
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Currently, if any partition on the target device is mounted (in device mode), or if the target partition is mounted (in partition mode), the process stops with an error message telling the user to unmount the target and try again.
This change automatically attempts to unmount the offending partition(s), and if unmounting is successful, allows the process to continue. This is especially useful on distributions where external drives are automatically mounted when connected.