Why does su fail with "authentication error"?
40667
How do I gain root privileges?
109370
Password not working in Graphical Applications (gksu)? Works with sudo
143086
Cannot authenticate without a password
92620
Tens of thousands of failed/denied SSH login attempts
54482
Why is there no option to login as root?
20334
SSH error: Permission denied, please try again
121883
Cannot login to my user account
86170
Can't login to my user account
114261
program not starting on login as it requires UAC prompt
86191
What is the difference between 'sudo' and 'su -c'
3348
Why am I still getting a password prompt with ssh with public key authentication?
119148
Hundreds of failed ssh logins
121291
SSH login as root fails, but I'm sure I entered the right password
88793
openSuse, new user cannot login
97950
Can't login using ssh as root
68462
Supply SU password in a bash script, within the script?
2901
Terminal command 'login' fails with error message