If I understand you correctly, you would like to set up a universal password that all users would have to input in order to execute a command as root with a sudo command.
Example:
- Account-A = Password-1
- Account-B = Password-2
- root = root-password
If Account-A or Account-B enters the command:
sudo apt-get autoclean
Then the subsequent output:
[sudo] password for root:
would be the same for both users.
This is typically NOT the preferred method of security through the use of sudo as implemented by Ubuntu.
This is not the recommended method of password implementation
For security reasons, Ubuntu does not enable a root user account. Unlike Debian, Ubuntu disables the root account.
You have been Warned this is not recommended!
Here's how it's done:
First, open a terminal and type the following command to set up a root password:
sudo passwd root
You will be prompted for your user-password to execute sudo. You will then be prompted to choose a password for root. You will then be prompted to re-enter the newly chosen password for root.
Next, change the default editor to nano instead of vi with this command:
sudo select-editor
You will be asked to choose an editor. Type the number that corresponds to "/bin/nano" and press enter.
Then, execute the following command to edit your sudoers file. You must use the visudo command to edit the /etc/sudoers file. Do NOT edit this file using gedit, do NOT use vi, DON'T use nano or leafpad or any other text editor because you risk locking yourself out of the sudo command completely for all users if there is a synatax error. Using visudo will fix syntax errors or alert you without saving the changes.
sudo visudo
Scroll down to the first line that begins with the word "Defaults" and press enter. Move up to the newly created blank line and insert the following line:
Defaults rootpw
Use the tab key between the two words and do not use spaces!!
Press ctrl + o to write out the changes to the file. When asked to save the file as "/etc/sudoers.tmp", delete ".tmp" and press enter to save the file as "/etc/sudoers" instead.
You will now be prompted for the root password whenever any user executes a command with sudo.
Refrences:
wiki.archlinux.org/index.php/sudo
how-do-i-make-sudo-ask-for-the-root-password
set-sudo-password-differently-from-login-one
Debian documents "sudo_configuration"
help.ubuntu.com/community/Sudoers
wiki.debian.org/sudo