i have a Dell inspiron n5010 Core i3 with intel hd vga i'm running ubuntu 11.10, i want to download and install the vga driver, i used the update manager but it didn't update my driver
Linux intel drivers are well supported by the Kernel and the X-system. You should be able to watch HD videos etc with the standard drivers that come with a default install.
I have an intel i3 CPU with Arrandale intel graphics and they work great.
Oneiric has the most recent and stable graphics drivers for Intel - you shouldnt need to install PPAs such as X-Stable or X-Edgers - these are testing PPAs.
If you have any specific issues then you should add this to your question.
to manage your drivers under Ubuntu trough a graphical interface you can use jockey
you can get info about your vga using the following command in a terminal
sudo lshw -C video
Since this driver do not have a really good and stable behaviour, various ppa are used to try to fix some bad issues, the most popular are
you can add a ppa to your system with
sudo apt-add-repository ppa:[ppa name]
for lazy people this mean
sudo apt-add-repository ppa:glasen/intel-driver
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
considering only the previous ppa.
after that you can update your software list with
sudo apt-get update
and install the required packages with
sudo apt-get install xserver-xorg-video-intel
after that reboot your machine.