我试图用几个 Nvidia GTX 980 卡更新系统的驱动程序，但不知何故我搞砸了，现在当我用 Nvidia 运行安装程序时遇到了这个错误：
ERROR: An NVIDIA kernel module 'nvidia-uvm' appears to already be loaded in your kernel. This may be because it is in use (for example, by the X server), but may also happen if your kernel was configured
without support for module unloading. Please be sure you have exited X before attempting to upgrade your driver. If you have exited X, know that your kernel supports module unloading, and still
receive this message, then …