screen flickers in ubuntu 11.04

I am facing the very similar problem. I installed ubuntu 11.04 and after rebooting the computer my screen flickers and i can't work in it. I have Intel 865G motherboard with inbuilt graphics card. I cant find any Additional drivers from system > Administration > Additional Drivers). Right now i'm logged in as ubuntu(no effects) and flickering is minimal in this mode.

The result of 'sudo lshw -c video':

consfire@consfire-desktop:~$ sudo lshw -c video
[sudo] password for consfire:
  *-display
       description: VGA compatible controller
       product: 82865G Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:16 memory:f0000000-f7ffffff memory:ffa80000-ffafffff ioport:ec00(size=8)
consfire@consfire-desktop:~$

I hope you will find some solution for me as i'm kind of new in linux-ubuntu platform and can't figure it out on my own.