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