[ubuntu] Ubuntu installation fails (12.04, 11.10, 11.04)

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http://ubuntuforums.org – Hi everyone, We bought a workstation for our lab - the T1650 workstation from Dell that comes with an Intel Xeon processor and a ATI Firepro V4900 graphics card. I have Windows 7 on it and I want to dual -boot with Ubuntu. I tried installing Ubuntu 12.04 (64 bit) on it and it installs properly but when the log in screen appears, the display is split in two -- the left part appears on the right half of the monitor and the right part appears on the left. If I log in, then a blank wallpaper can be seen without any icons (the screen is still split and reversed). I installed 11.04 and 11 (Hardware)