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Improve error message when Tails Cloner can't format the destination USB stick because it's already mounted

To reproduce in Tails 6.1:

  1. Plug in another USB stick with a LUKS partition (non-LUKS might work as well).

  2. Open a file in this LUKS partition, so that unmounting is impossible.

  3. Try to clone the current Tails onto this other USB stick.

    Error message:

    udisks-error-quark: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/dm-1: target is busy (14)
Tails installation failed!
udisks-error-quark: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/dm-1: target is busy (14)

This error message should explain better what caused the error and how to solve it.

Edited by sajolida
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