Unfortunately as I don't use Ubuntu or a similar graphics card so I won't be able to walk you through it, but if you need further help you really should ask at the ubuntu forums.
My guess would that you need to install "xserver-xorg-video-intel"
Then edit /etc/X11/xorg.conf and hunt down this bit (This is just an example from my own, I use an NVIDIA video card)
Code:
Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
EndSection
and replace the driver with "intel"
Code:
Section "Device"
Identifier "Generic Video Card"
Driver "intel"
EndSection
That's only my guess though and doing these steps are entirely at your own discretion, if in doubt just try the forums I linked to for help.
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