To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

administrator@ubuntu:~$ root
The program 'root' is currently not installed.  You can install it by typing:
sudo apt-get install root-system-bin
administrator@ubuntu:~$ sudo apt-get install root-system-bin
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
administrator@ubuntu:~$ sudo apt-get install root-system-bin
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
administrator@ubuntu:~$ sudo apt-get install root-system-bin
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package root-system-bin
administrator@ubuntu:~$