This post appears to solve the problem
https://github.com/linuxmint/Cinnamon/issues/5410#issuecomment-231620826
** Bug watch added: github.com/linuxmint/Cinnamon/issues #5410
https://github.com/linuxmint/Cinnamon/issues/5410
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Public bug reported:
Running Ubuntu 16.04.6 with both Unity & Cinnamon installed. When
opening Cinnamon's settings, every time I click on the power management
section, the window closes. Running cinnamon-settings from the command-
line outputs the following:
Could not find bluetooth module; is
