How to change back to classic menu. The new menu is horrible:
1) Click on the Ubuntu icon on the top left corner, type “login screen” and click on the “Login Screen” application
2) Click unlock, enter password and the window should become the following, choose “Ubuntu Classic” from the dropdown menu, click Close then REBOOT.
If Live CD / USB boot is used, then it will prompt username/pw after reboot. The default username/pw is 'ubuntu' and blank password