Comment 29 for bug 327793

I'm really sorry guys,
I'm don't really know how to use this website, so I try something ...... and apparently it's not a good thing to do :(
And I not good at English too ....

I got this problem when enabling compiz in Karmic Koala (and yes, I'm using nvidia) ...... and I have solved it .....

1. Open up a terminal and type sudo su (enter your password)
2. Type gedit /etc/X11/xorg.conf
3. From the xorg.conf file, find the section called Section "Device" and just before EndSection, add the following and save the file:
          Option "AddARGBVisuals" "True"
          Option "AddARGBGLXVisuals" "True"

4. Here is an example of an edited Section (your Section may vary):
          Section "Device"
          Identifier "Videocard0"
          Driver "nvidia"
          VendorName "NVIDIA Corporation"
          BoardName "GeForce 6150"
          Option "AddARGBVisuals" "True"
          Option "AddARGBGLXVisuals" "True"
          EndSection

   5. Restart Ubuntu and the titlebar with related window decorations should reappear

I got this from here http://www.pendrivelinux.com/ubuntu-desktop-effects-fixing-the-missing-titlebar/