Ubuntumate 15.10 cannot login

I использовал mini.iso and install "ubuntu-mate-desktop" only and when reboot, I cannot login the window.

When прессинг Ктрл Альт F1, I хан log in the command prompt with the account and password I coded during installation. An ошибка message "Failed to start session" appeared with сеть boundary appeared just on the dialog box below the password entry field.

How to solve this problem?