Why I got 'unable to resolve host' when I do 'sudo'?
10360
Error message "sudo: unable to resolve host (none)"
16116
How to modify an invalid '/etc/sudoers' file?
58819
Sudo not available in guest login
67021
Access denied for user 'root@localhost' (using password:NO)
86607
sudo permission denied but su grants permission
28988
Why do I get "Permission denied" when redirecting the output of sudo echo "xyz" to a file?
138134
Cannot access local webpage (error: could not resolve host)
66222
'sudo' not working after changing the permissions of '/usr' directory
39109
Trying to ssh root, why get permssion denied in 16.04?
111138
Sudo command no longer functions properly
60165
Why is it called sudo?
135331
I changed /etc/sudoers, and now I can't run as sudo
14750
How to Fix "Read-only file system" error when I run something as sudo and try to make a folder/file?
85093
'sudo su -' vs 'sudo -i' vs 'sudo /bin/bash' - when does it matter which is used, or does it matter at all?
31899
" sudo: source: command not found"
144161
Why is the /etc/hosts file not working?
45541
How to fix sudo after "chmod -R 777 /usr/bin"?