Ubuntu – Permission denied error

permissions

I am not able to change into a root user, problem is when I give the command root, it asks for password, but the keyboard doesn't work after that though the enter key. After three strikes says "three incorrect attempts".

This is what it shows

avinish@ubuntu:~$ /etc/sudoers
bash: /etc/sudoers: Permission denied

Please help!

Best Answer

Type in sudo su rootin your terminal window. It will prompt you for your login password. That is, type in youur regular password. Once you have done that you will see root@ubuntu:/home/avinish# instead of avinish@ubuntu:~

Now typepasswd and hit the enter key.

It will prompt you to enter new unix password. Give in watever password you want for the root user.

Note: you wont be able to see anything while entering your password.

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Ubuntu – permission denied for root@localhost for ssh connection

By default, the SSH server denies password-based login for root. In /etc/ssh/sshd_config, if the following line exists, possibly commented out (with a # in front):

PermitRootLogin without-password

Then change it to the following, uncommenting if needed (remove the # in front):

PermitRootLogin yes

And restart SSH:

sudo service ssh restart

Or, you can use SSH keys. If you don't have one, create one using ssh-keygen (stick to the default for the key, and skip the password if you feel like it). Then do sudo -s (or whatever your preferred method of becoming root is), and add an SSH key to /root/.ssh/authorized_keys:

cat /home/user/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

Ubuntu – SSH Permission denied (using right password)

Instead of using the hostname of the server, try using the ip-adres.
I ran into the same problem when setting up my server and this seemed to resolve the problem.

ssh [username]@[host_ip-adres]

If you want to use the hostname you might need to set up a dns-server.
but you can do without.

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