To add ubuntu host to domain i will use packet likewise-open5
sudo apt-get install likewise-open5
Edit /etc/nsswitch.conf and change hosts to:
hosts: files dns [NOTFOUND=return]
Edit /etc/resolvconfd/resolv.conf.d/head and add:
nameserver YOUR_AD_IP
Now restart networking service
sudo /etc/init.d/networking restart
And add machine to domain
domainjoin-cli YOURDOMAINNAME.LOCAL DOMAIN_ADMIN_ACCOUNT