不知道从哪里找到的这个方案，反正是能解决了这个问题：
重新升级了CUDA以后，发现在安装CUDA8.0后，分辨率变成800×600，而且不能改变，最终在网上找到了这个方法，运行下面几行代码，然后重启就好了，具体原因还是不是很清楚。
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.backup sudo touch /etc/X11/xorg.conf sudo reboot下面是错误信息，在重新安装完成显卡驱动后，进入桌面，会出现下面的错误：
Could not apply the stored configuration for monitors none of the selected modes were compatible with the possible modes: Trying modes for CRTC 63 CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) Trying modes for CRTC 64 CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) Trying modes for CRTC 65 CRTC 65: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 65: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) Trying modes for CRTC 66 CRTC 66: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 66: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1)如果同时不能显示左边栏和上面的菜单，那么可能需要重置一下unity显示问题：
sudo apt-get install compizconfig-settings-manager sudo ccsm然后Ubuntu Unity Plugin，把相关的都enable了。
如果这样还是不行，那么
dconf reset -f /org/compiz/ setsid compiz --replace[1] https://blog.csdn.net/hanlin_tan/article/details/70040114
