Add Ubuntu Machine to Windows Domain

Windows Domain name: example.com
Ip address : 10.0.0.1

In Ubuntu Machine
Step1:  run  sudo  apt-get install likewise-open5

Step2: change Ubuntu machine Ip address


Step3:  open /etc/resolve.conf

add
search domain name
nameserver dns server ip

In my case I added below lines

search example.com
nameserver 10.0.0.1

Step 4:
sudo domainjoin-cli join

sudo domainjoin-cli join example.com administrator

Restart your machine

To conform
Go to your Windows Domain Controller
open Active Directory Users and Computers -> Computers
ubuntu machine will appear

How to add a user to the sudoer

Open /etc/sudoers
you can find a line
## Allow root to run any commands anywhere
then add
  ALL=(ALL)       ALL