How to Repair permissions and rebuild kext cache in macOS.


May 2, 2020
Repair permissions in /S/L/E (System/Library/Extensions) and /L/E (Library/Extensions) folders.

Type/copy each of the following commands (separately) in Terminal:
  • sudo chmod -Rf 755 /S*/L*/E*
  • sudo chmod -Rf 755 /L*/E*
  • sudo chown -Rf 0:0 /S*/L*/E*
  • sudo chown -Rf 0:0 /L*/E*
Rebuild Kext Cache:
Type/copy the following command in Terminal:
  • sudo kextcache -i /
Restart your computer for the repairs to take effect.

Easiest way to get these commands right when entering them in to Terminal is to copy and paste each line, one at a time and press enter after pasting the line of text to activate it.
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