everything should start and now you are at the login,
enter root and the password
$ su
enter root password
Remove the cd from the sources
http://askubuntu.com/questions/236288/apt-get-asks-me-to-insert-cd-why
$ gedit /etc/apt/sources.list
and simply add to this line with the #-sign so that it looks something like this:
# deb cdrom:[Ubuntu 12.10
then do:
$ apt-get update
Install sudo (you'll be able to execute commands as administrator without becoming root first)
$ apt-get install sudo
Creating new user and making it an administrator
$ adduser myuser
Type in a password and don't forget it. Press enter at all the other questions.
Add 'myuser' to the sudoers
$ visudo
http://serverfault.com/questions/58378/add-new-user-with-root-access-in-linux
Scroll down and under the line where is says root type your name
## Allows just user "username" to run all commands as root
mir ALL=(ALL) ALL
Type to exit the root shell
$ exit