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So, there was a problem before with display so i reinstall gnome and nvidia graphic driver; It seems like the gdm wasn't reinstalled properly as ubuntu doesn't start;
It holds at this moment:

enter image description here

The gnome GUI doesn't load correctly as well. I started it like: startx from terminal;

The GUI looks like this:

enter image description here

As you may see from above image there's no bar for menu and application;

How can i fix it?

Info from xorg.conf:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 290.10  (  Wed Nov 16 20:32:22 PST 2011

Section "ServerLayout"
   Identifier     "Layout0"
   Screen      0  "Screen0"
   InputDevice    "Keyboard0" "CoreKeyboard"
   InputDevice    "Mouse0" "CorePointer"

Section "Files"

Section "InputDevice"
   # generated from default
   Identifier     "Mouse0"
   Driver         "mouse"
   Option         "Protocol" "auto"
   Option         "Device" "/dev/psaux"
   Option         "Emulate3Buttons" "no"
   Option         "ZAxisMapping" "4 5"

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
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up vote 0 down vote accepted

It's all about your nvidia driver. Ubuntu failed to load unity. That's means your nvidia driver is not working correctly. What is your nvidia's specification and what driver do you use?

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I've added /etc/X11/xorg.conf info; How can switch from unity to ubuntu classic via terminal? – ted Dec 29 '11 at 13:31
Shouldn't greeter load at least, if it's all about nvidia driver?<br /> I've make lightdm-greeter the default one and ubuntu loaded. Thank you. I'll try to make gdm start then. – ted Dec 29 '11 at 13:36
backup your /etc/X11/xorg.conf. Then delete it. Ubuntu will automatically select best driver. To start login page: sudo /etc/init.d/lightdm stop THEN sudo /etc/init.d/lightdm start – shantanu Dec 29 '11 at 13:54
So, the problem wasn't really in nvidia driver, just in me. Some how i mess to install gnome, so lightdm loaded instead when startx and ubuntu doesn't start properly because gdm's greeter was used (not lightdm's one). – ted Dec 29 '11 at 14:09

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