no way to launch onboard keyboard from lock screen using detachable tablet.

[Daniel Risacher]

While using Ubuntu MATE 17.10 on a Dell tablet, I pulled the tablet from
the docking station, only to find that there was no apparent way to launch
the onscreen keybaord (onboard) from the lock screen - and thus no way to
unlock the tablet, save attaching a keyboard.

Am I missing a trick?  This seems like a bug / missing (important)
feature..?
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