I believe this fix causes a regression with NoteBook Fan Control (NBFC) as 
lifting the kernel lockdown was used as a workaround to enable NBFC to control 
fan speed.
See https://github.com/hirschmann/nbfc/issues/414#issuecomment-354274657 and 
https://github.com/hirschmann/nbfc/issues/472 

Would there be another workaround than "simply" disable UEFI secure
boot?

** Bug watch added: github.com/hirschmann/nbfc/issues #414
   https://github.com/hirschmann/nbfc/issues/414

** Bug watch added: github.com/hirschmann/nbfc/issues #472
   https://github.com/hirschmann/nbfc/issues/472

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https://bugs.launchpad.net/bugs/1851380

Title:
  root can lift kernel lockdown

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