Ubuntu has been installed in VMWare using easy install (or something sounding like this). Therefore the OS starts now in text mode and to access GUI I have to type startx.
How to enable the GUI with graphical login screen?
/etc/default/grub file has following values inside:
.... GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" .... #GRUB_TERMINAL=console
so it corresponds to recommendations how to turn graphical login on.