我正在运行 Ubuntu 12.04，配有 GeForce GTX 770（产品编号 P4-2773-KR）。几天前，重启后，Nvidia 驱动程序停止工作。“附加驱动程序”窗口显示 nvidia 驱动程序版本 331-updates“已激活但当前未使用”。显示器分辨率限制为 1024x768。以下是 Xorg 日志和系统日志中提及 nvidia 的摘录：
Xorg.0.log
[ 2.165] (II) "glx" will be loaded by default.
[ 2.165] (II) LoadModule: "glx"
[ 2.166] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so
[ 2.229] (II) Module glx: vendor="NVIDIA Corporation"
[ 2.229] compiled for 4.0.2, module version = 1.0.0
[ 2.229] Module class: X.Org Server Extension
[ 2.229] (II) NVIDIA GLX Module 304.123 Wed Jul 2 11:19:55 PDT 2014
[ 2.229] Loading extension GLX
[ 2.229] (II) LoadModule: "nvidia"
[ 2.229] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
[ 2.235] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 2.235] compiled for 4.0.2, module version = 1.0.0
[ 2.235] Module class: X.Org Video Driver
[ 2.246] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your
[ 2.246] (EE) NVIDIA: system's kernel log for additional error messages.
[ 2.246] (II) UnloadModule: "nvidia"
[ 2.246] (II) Unloading nvidia
[ 2.246] (EE) Failed to load module "nvidia" (module-specific error, 0)
系统日志
Nov 10 19:11:32 rll3 kernel: [ 1.680235] nvidia: module license 'NVIDIA' taints kernel.
Nov 10 19:11:32 rll3 kernel: [ 1.680238] Disabling lock debugging due to kernel taint
Nov 10 19:11:32 rll3 kernel: [ 1.683502] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Nov 10 19:11:32 rll3 kernel: [ 1.683727] nvidia: Unknown symbol mcount (err 0)