Open the terminal command and follow the steps. If you need any help make sure to view the how to video for assistance.
Step 1 ||
wget http://de.archive.ubuntu.com/ubuntu/pool/main/l/likewise-open/likewise-open_6.1.0.406-0ubuntu10_amd64.deb
Step 2 ||
wget http://de.archive.ubuntu.com/ubuntu/pool/main/libg/libglade2/libglade2-0_2.6.4-1ubuntu3_amd64.deb
Step 3 ||
Step 4 || sudo dpkg -i likewise-open_6.1.0.406-0ubuntu10_amd64.deb
Step 5 || sudo dpkg -i libglade2-0_2.6.4-1ubuntu3_amd64.deb
Step 6 || sudo dpkg -i likewise-open-gui_6.1.0.406-0ubuntu10_amd64.deb
Time to access the Likewise GUI to join your Windows Active Directory
Step 7 || sudo domainjoin-gui
Step 8 || reboot
Ubuntu 14.04 accepts only internal system users on Logon screen and doesn’t provide the ability to manual login a user from Active Directory.
Step 9 || To actually perform a GUI Logon on Ubuntu 14.04 with an Active Directory User you will need to edit the ‘50-ubuntu.conf‘ file located in ‘/usr/share/lightdm/lightdm.conf.d/‘ path and add the following lines then reboot to apply changes.
allow-guest=false
greeter-show-manual-login=true
Step 10 || reboot
After reboot on Logon screen select Login and provide your Active Directory User credentials with related to syntax.
domain_name\domain_user [this one works best J]
domain_name.tld\domain_user
domain_user
Extra Goodies
Enable Active Directory Administrative Rights
Remote users from Active Directory have the same Standard status as internal Ubuntu users and are not allowed to perform administrative tasks on system. To grant root privileges to an Active Directory Administrative User, issue the following command with root privileges.
$ sudo usermod -a -G sudo AD_administrative_user
Basically the above command, adds the Active Directory Administrative User to Ubuntu local group “sudo”, group enabled with root powers.