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I run the following command: 

  sudo chown -R :NewGroup /usr <--- I changed the assigned Group not the owner

Then, I get the following error: 

sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

Does anyone know how to fix this?

ALGDB
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    Likely a duplicate of https://askubuntu.com/a/471503/155411. Give that a try. – Vin Mar 16 '18 at 23:34
  • Sounds like you broke sudo... – NerdOfCode Mar 17 '18 at 01:48
  • See my answer here - https://askubuntu.com/questions/43621/what-if-i-accidentally-run-command-chmod-r-on-system-directories-etc – Panther Mar 17 '18 at 02:12
  • Hi there, thanks for the replay. All this answers are for a change in the owner of the folder I didn't change the owner. I changed the group, all the dirs in the /usr are owned by root and now them are assigned to "newGroup". Is in this case still necessary to reninstall the whole OS? – ALGDB Mar 17 '18 at 09:33
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    The answers there will work the same with a very slight modification, still use the same command, especially my answer, which will reset all ownership, owner and group. – Panther Mar 17 '18 at 14:39

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