root login authentication failure, how to use sudo?
136007
How to enable root login again after changing password?
16116
How to modify an invalid '/etc/sudoers' file?
36582
How to run an application using sudo without a password?
134935
Root access that can't change root password?
18926
Type 'sudo' is not known in source list
124795
sudo does not ask for password
130082
How to change root password in ubuntu?
47738
Error after sudo-ing "sudo: must be setuid root"
88413
Best practices on using sudo in a bash script
61534
Prompt for sudo password rather than give access error
15255
How can I add a new user as sudoer using the command line?
53868
How to change the forgotten root password?
107825
can't login as mysql user root from normal user account in ubuntu 16.04
19524
How can I determine the sudo password?
157633
How to make 'sudo' grab the password from a file?
89652
Lost access to sudo
136771
Why is sudoers NOPASSWD option not working?