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12.04 updates caused blue screen after login with taskbar or icons

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linux-howto

http://askubuntu.com – i'm still new to linux and have been testing it out on my laptop. i ran updates on ubuntu 12.04lts and something failed along the way. after reboot, when i log in, the screen is blue and the icons and taskbar are not displayed. i cannot even open up the terminal. i ran sudo apt-get install ubuntu-desktop and that fixed the issue, however, i am only limited to ubuntu at login. the ubuntu-2d option (unity-2d) is now missing. i tried reinstalling unity-2d with sudo apt-get install unity-2d and to no luck. sorry i'm a newb. any advice is welcomed. (HowTos)