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rated 0 times [ 3] [ 0] / answers: 1 / hits: 34309 / 3 Years ago, mon, august 30, 2021, 7:15:37

I just typed "sudo chmod 770 ." on my /usr/bin directory by mistake

[acc]:/usr/bin$ sudo chmod 770 .

Now every time i run a sudo command I get a "Permission denied" error

[acc]~$ sudo

bash: /usr/bin/sudo: Permission denied

When I open a new terminal, i get: "bash: groups: command not found"

Please help me resolve this... :(

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answered 3 Years ago ingssex · Accepted Answer

You should boot from a LiveCD then do the following:

Mount your Ubuntu installation by clicking on the device's icon in the file manager.

Open a terminal and cd into the /usr/bin folder of that installation you mounted from above.

Run this command to give all users execute permissions
```
sudo chmod -R a+x .
```

Run this command to remove all users (except root's) write permissions
```
sudo chmod -R o-w .
```