This is a simple and device-agnostic indicator. It should work on normal Ubuntu-like systems (at least 14.04+) with onboard installed. Customize onboard settings to your likings (show when editing text, dock to screen border, resize workspace). For more device-specific adjustments, you can find alternative scripts (Lenovo Yoga 3, Thinkpad...).
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Laptop mode: physical keyboard, touchpad
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Tablet mode: onscreen keyboard; physical keyboard and touchpad disabled
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Rotations (both touch input and display output)
Unzip to ~/.local/bin/
Open "Startup aplications" and add python ~/.local/bin/indicator-tablet-mode/indicator-tablet-mode.py