1.sudo /etc/init.d/gdm stop

提示：rather than invoking init scripts through /etc/init.d,use the service(8) utility,e.g. service gdm stop

since the script you are attempting to invoke has been converted to an Upstart job,you may also use the stop(8) utility,e.g. stop gdm

2.sudo service gdm stop
提示:stop:Unkown instance:

3.sudo killall Xorg

!!!!!!!

都试过，一直提示让我先关掉X。百度谷歌了好多，内容大概也就这几个。请帮下忙。

sudo service lightdm stop

11.10 就换了lightdm了

多谢！！！！可以运行那个驱动了。不过，新的问题又来了，我先去网上找一下。如果没找到再来麻烦你。