/usr/bin/sudo must be owned by uid 0 and have the setuid bit set
11036
Changed permissions of / to user
116001
Why does the root user need sudo permission?
31899
" sudo: source: command not found"
41948
warning message at command line `sudo`
136590
How do I deal with 'sudoers.so must be only be writable by owner'?
92250
Is there a "reverse sudo"?
111046
sudo: /var/lib/sudo/navneet writable by non-owner (040777), should be mode 0700
138512
Trouble with running cd with sudo as another user
4711
Can't execute terminal commands: "the command 'sudo' is available in '/usr/bin/sudo'"
119015
Sudo doesn't work on Aliases
4746
How to solve "permission denied" when using sudo with redirection in Bash?
94655
How do I solve "Incorrect permission on/usr/lib/policykit-1/polkit-agent-helper-1(need to setuid root)"?
70508
How do I edit /etc/sudoers from a script?
158454
Setuid bit seems to have no effect on bash
29347
Allow setuid on shell scripts
11369
How can I `alias sudo !!`?
56480
sudo: /var/lib/sudo writable by non-owner (040777), should be mode 0700