在 Ubuntu 15.04 上，当使用大多数 gnome 应用程序时，几秒钟后一切都会关闭，我回到登录提示。我尝试使用 nouveau 和 Nvidia 驱动程序，但没有变化。Chrome 运行良好，Krusader 和 Terminal 也运行良好。lspci 给我：
VGA compatible controller: NVIDIA Corporation GF108M [GeForce 610M] (rev a1) (prog-if 00 [VGA controller])
Subsystem: QUANTA Computer Inc Device 0925
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
Memory at b0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 5000 [size=128]
Expansion ROM at d3000000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
Kernel driver in use: nouveau
我在 dmesg 中发现了一些相关信息：
nvidia: module license 'NVIDIA' taints kernel.
[ 19.519205] Disabling lock debugging due to kernel taint
[ 19.522175] nvidia: module verification failed: signature and/or required key missing - tainting kernel
或者NVRM: The NVIDIA probe routine was not called for 1 device(s). [ 19.756546] NVRM: This can occur when a driver such as: NVRM: nouveau, rivafb, nvidiafb or rivatv NVRM: was loaded and obtained ownership of the NVIDIA device(s). [ 19.756549] NVRM: Try unloading the conflicting kernel module (and/or NVRM: reconfigure your kernel without the conflicting NVRM: driver(s)), then try loading the NVIDIA kernel module NVRM: again. [ 19.756551] NVRM: No NVIDIA graphics adapter probed! [ 19.756553] [drm] Module unloaded [ 19.756737] NVRM: NVIDIA init module failed!
之前一直可以正常工作，直到更新。我浏览了很多论坛，但找不到任何有用的东西，所以欢迎提出任何建议，谢谢！