Blue screen after Ubuntu login does not show the desktop solution

Problem analysis
Start Ubuntu to enter the login screen, indicating that the system can be run up. No big chunk of the core data corruption, Linux system can generally be repaired, must be calm. The problem is that the previous brute force shutdown damaged Ubuntu's graphics system configuration, causing the graphical interface to not function properly. So I saw the ability to log in, but only a blue.
Problem solving
This time to ask for the old character interface. In order to "make a fist", enter the character interface first: Ctrl + Alt + F4
Then install the appropriate service, and then reset it.
sudo apt-get install Xserver-xorg-lts-utopic
sudo dpkg-reconfigure xserver-xorg-lts-utopic
Reboot
If there is a problem with the first operation, you need to reset dpkg and try again, just follow the instructions.
sudo dpkg--configure-a
Have seen other people not install xserver-xorg-lts-utopic, but xserver-xorg-lts-quantal. The estimate is a version issue.
After the reboot system, the friendly graphical interface finally came back.