[ubuntu] Trouble Installing Ubuntu Desktop

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http://ubuntuforums.org – Trying to install Ubuntu on a Dell Desktop computer. I'm stuck on the "Splash Screen" for the last 45 min. (The screen with the 5 dots under "ubuntu".) The dots are changing from While to Red, but its been on this screen for 45min. I've rebooted the computer several times, and it still stays locked on the screen. I can not use CTRL+ATL+F2 I was able to install Ubuntu Server without issue, but the Desktop version will not seem to install. (Hardware)