重新安裝顯示卡驅動：
(1) 在文字模式下重新安裝顯示卡驅動：
參考：http://blog.csdn.net/ssmixi/article/details/73483795
若出現錯誤：
ERROR：Unable to find the kernel source tree for the currently running kernel. Please make sure you have installed the kernel source files for your kernel and that they are properly configured on Red Hat Linux system, for exzmple ,be sure you have the ‘kernel-source’ or ‘kernel-devel’ RPM installed .If you know the correct kernel source files are installed ,you may specify the kernel source path with the ‘–kernel-source-path’ command line option.
解決辦法：sudo apt-get install linux-headers-generic
（參考自