Tux password after installation

General Linux Help
1

I installed the system on hard disk, but i cannot use the sudo apt-get update command.

  • The system ask for user “tux” password. Does tux have one? I read it didn’t.
    I tried with the password i set up at installation, but the field for entering the password does not accept keyboard entries, only Enter, and then the system returns an “incorrect password” notice.
  • sudo apt-get install name-of-software is also not accepted because of no rights to perform the command. the system asks are you root?
    Is there anything that I missed reading?
    Thanks for any help you may provide.
2

If you enter su as a command, you should then be asked for the password you set up at install. Then you can run apt-get install xxxxxxxxxxx