You aren't in Ubuntu. There's a boot failure. At this point, just reinstall, wipe the OS completely. There isn't any easy fix we can talk you through as a beginner. Whereas an install should be 12 minutes.
https://help.ubuntu.com/community/In...n/FromUSBStick
There are instructions for Windows, OSX, and Linux systems. If all you have is this machine, you'll need a friend's machine to make an install flash drive. A 4G flash drive should be enough. It will be completely wiped. USB, SDHC whatever slots your laptop has should work. I often boot my laptops from an SDHC slot to try new releases out. USB2 or USB3 flash can work too. If USB3 doesn't work, try the USB2 port on the machine. It will be a little slower, but that really doesn't matter for emergency needs like this.
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