Ubuntu 14.04システムを再起動した後、Unityに再度ログインできず、Gnomeを使用する必要がありました。以下を実行すると、GLXに問題があります。
/usr/lib/nux/unity_support_test -p
次のメッセージを受け取りました。
Error: GLX is not available on the system
またはless（関連部分）の出力は/var/log/Xorg.0.log次のようになります。
[ 682.533] (II) LoadModule: "glx"
[ 682.533] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so
[ 682.533] (EE) Failed to load /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so: libnvidia-tls.so.349.16: cannot open shared object file: No such file or directory
[ 682.533] (II) UnloadModule: "glx"
[ 682.533] (II) Unloading glx
[ 682.533] (EE) Failed to load module "glx" (loader failed, 7)
[ 682.533] (==) Matched nvidia as autoconfigured driver 0
[ 682.533] (==) Matched nouveau as autoconfigured driver 1
[ 682.533] (==) Matched nvidia as autoconfigured driver 2
[ 682.533] (==) Matched nouveau as autoconfigured driver 3
[ 682.533] (==) Matched modesetting as autoconfigured driver 4
[ 682.533] (==) Matched fbdev as autoconfigured driver 5
[ 682.533] (==) Matched vesa as autoconfigured driver 6
[ 682.533] (==) Assigned the driver to the xf86ConfigLayout
[ 682.533] (II) LoadModule: "nvidia"
[ 682.533] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
[ 682.534] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 682.534] compiled for 4.0.2, module version = 1.0.0
[ 682.534] Module class: X.Org Video Driver
[ 682.534] (II) LoadModule: "nouveau"
[ 682.534] (WW) Warning, couldn't open module nouveau
[ 682.534] (II) UnloadModule: "nouveau"
[ 682.534] (II) Unloading nouveau
[ 682.534] (EE) Failed to load module "nouveau" (module does not exist, 0)
[ 682.534] (II) LoadModule: "modesetting"
[ 682.534] (WW) Warning, couldn't open module modesetting
[ 682.534] (II) UnloadModule: "modesetting"
[ 682.534] (II) Unloading modesetting
[ 682.534] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 682.534] (II) LoadModule: "fbdev"
[ 682.534] (WW) Warning, couldn't open module fbdev
[ 682.534] (II) UnloadModule: "fbdev"
[ 682.534] (II) Unloading fbdev
[ 682.534] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 682.534] (II) LoadModule: "vesa"
[ 682.534] (WW) Warning, couldn't open module vesa
[ 682.534] (II) UnloadModule: "vesa"
[ 682.534] (II) Unloading vesa
[ 682.534] (EE) Failed to load module "vesa" (module does not exist, 0)
[ 682.534] (==) Matched nvidia as autoconfigured driver 0
[ 682.534] (==) Matched nouveau as autoconfigured driver 1
[ 682.534] (==) Matched nvidia as autoconfigured driver 2
[ 682.534] (==) Matched nouveau as autoconfigured driver 3
[ 682.534] (==) Matched modesetting as autoconfigured driver 4
[ 682.534] (==) Matched fbdev as autoconfigured driver 5
[ 682.534] (==) Matched vesa as autoconfigured driver 6
[ 682.534] (==) Assigned the driver to the xf86ConfigLayout
[ 682.534] (II) LoadModule: "nvidia"
[ 682.534] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
[ 682.534] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 682.534] compiled for 4.0.2, module version = 1.0.0
[ 682.534] Module class: X.Org Video Driver
[ 682.534] (II) UnloadModule: "nvidia"
[ 682.534] (II) Unloading nvidia
[ 682.534] (II) Failed to load module "nvidia" (already loaded, 32523)
[ 682.534] (II) LoadModule: "nouveau"
[ 682.534] (WW) Warning, couldn't open module nouveau
[ 682.534] (II) UnloadModule: "nouveau"
[ 682.534] (II) Unloading nouveau
[ 682.534] (EE) Failed to load module "nouveau" (module does not exist, 0)
[ 682.534] (II) LoadModule: "modesetting"
[ 682.535] (WW) Warning, couldn't open module modesetting
[ 682.535] (II) UnloadModule: "modesetting"
[ 682.535] (II) Unloading modesetting
[ 682.535] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 682.535] (II) LoadModule: "fbdev"
[ 682.535] (WW) Warning, couldn't open module fbdev
[ 682.535] (II) UnloadModule: "fbdev"
[ 682.535] (II) Unloading fbdev
[ 682.535] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 682.535] (II) LoadModule: "vesa"
[ 682.535] (WW) Warning, couldn't open module vesa
[ 682.535] (II) UnloadModule: "vesa"
[ 682.535] (II) Unloading vesa
[ 682.535] (EE) Failed to load module "vesa" (module does not exist, 0)
[ 682.535] (II) NVIDIA dlloader X Driver 349.16 Tue Apr 7 23:19:49 PDT 2015
[ 682.535] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[ 682.535] (++) using VT number 7
[ 682.539] (II) Loading sub module "fb"
[ 682.539] (II) LoadModule: "fb"
[ 682.539] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 682.540] (II) Module fb: vendor="X.Org Foundation"
[ 682.540] compiled for 1.15.1, module version = 1.0.0
[ 682.540] ABI class: X.Org ANSI C Emulation, version 0.4
[ 682.540] (II) Loading sub module "wfb"
[ 682.540] (II) LoadModule: "wfb"
[ 682.540] (II) Loading /usr/lib/xorg/modules/libwfb.so
[ 682.540] (II) Module wfb: vendor="X.Org Foundation"
[ 682.540] compiled for 1.15.1, module version = 1.0.0
[ 682.540] ABI class: X.Org ANSI C Emulation, version 0.4
[ 682.540] (II) Loading sub module "ramdac"
[ 682.540] (II) LoadModule: "ramdac"
[ 682.540] (II) Module "ramdac" already built-in
[ 682.540] (II) NVIDIA(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 682.540] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[ 682.540] (==) NVIDIA(0): RGB weight 888
[ 682.540] (==) NVIDIA(0): Default visual is TrueColor
[ 682.540] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[ 682.540] (**) NVIDIA(0): Enabling 2D acceleration
[ 682.540] (EE) NVIDIA(0): Failed to initialize the GLX module; please check in your X
[ 682.540] (EE) NVIDIA(0): log file that the GLX module has been loaded in your X
[ 682.540] (EE) NVIDIA(0): server, and that the module is the NVIDIA GLX module. If
[ 682.540] (EE) NVIDIA(0): you continue to encounter problems, Please try
[ 682.540] (EE) NVIDIA(0): reinstalling the NVIDIA driver.
[ 682.549] (II) NVIDIA(GPU-0): Found DRM driver nvidia-drm (20150116)
[ 682.550] (II) NVIDIA(0): NVIDIA GPU Quadro K2200 (GM107GL-A) at PCI:3:0:0 (GPU-0)
[ 682.550] (--) NVIDIA(0): Memory: 4194304 kBytes
[ 682.550] (--) NVIDIA(0): VideoBIOS: 82.07.5a.00.01
[ 682.550] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[ 682.622] (--) NVIDIA(0): Valid display device(s) on Quadro K2200 at PCI:3:0:0
[ 682.622] (--) NVIDIA(0): CRT-0
[ 682.622] (--) NVIDIA(0): DFP-0
[ 682.622] (--) NVIDIA(0): DFP-1
[ 682.622] (--) NVIDIA(0): DFP-2
[ 682.622] (--) NVIDIA(0): DELL U2711 (DFP-3) (connected)
[ 682.622] (--) NVIDIA(0): DELL 2709W (DFP-4) (boot, connected)
[ 682.622] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[ 682.622] (--) NVIDIA(0): DFP-0: Internal TMDS
[ 682.622] (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[ 682.622] (--) NVIDIA(0): DFP-1: Internal TMDS
[ 682.622] (--) NVIDIA(GPU-0): DFP-1: 165.0 MHz maximum pixel clock
[ 682.622] (--) NVIDIA(0): DFP-2: Internal TMDS
[ 682.622] (--) NVIDIA(GPU-0): DFP-2: 165.0 MHz maximum pixel clock
[ 682.622] (--) NVIDIA(0): DELL U2711 (DFP-3): Internal DisplayPort
[ 682.622] (--) NVIDIA(GPU-0): DELL U2711 (DFP-3): 960.0 MHz maximum pixel clock
[ 682.623] (--) NVIDIA(0): DELL 2709W (DFP-4): Internal DisplayPort
[ 682.623] (--) NVIDIA(GPU-0): DELL 2709W (DFP-4): 960.0 MHz maximum pixel clock
[ 682.623] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[ 682.623] (**) NVIDIA(0): device DELL U2711 (DFP-3) (Using EDID frequencies has been
[ 682.623] (**) NVIDIA(0): enabled on all display devices.)
[ 682.625] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[ 682.625] (**) NVIDIA(0): device DELL 2709W (DFP-4) (Using EDID frequencies has been
[ 682.625] (**) NVIDIA(0): enabled on all display devices.)
[ 682.642] (==) NVIDIA(0):
[ 682.642] (==) NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
[ 682.642] (==) NVIDIA(0): will be used as the requested mode.
[ 682.642] (==) NVIDIA(0):
[ 682.642] (II) NVIDIA(0): Validated MetaModes:
[ 682.642] (II) NVIDIA(0): "DFP-4:nvidia-auto-select,DFP-3:nvidia-auto-select"
[ 682.642] (II) NVIDIA(0): Virtual screen size determined to be 4480 x 1440
[ 682.643] (--) NVIDIA(0): DPI set to (84, 84); computed from "UseEdidDpi" X config
[ 682.643] (--) NVIDIA(0): option
[ 682.643] (--) Depth 24 pixmap format is 32 bpp
[ 682.644] (II) NVIDIA: Using 3072.00 MB of virtual memory for indirect memory
[ 682.644] (II) NVIDIA: access.
[ 682.649] (II) NVIDIA(0): Setting mode "DFP-4:nvidia-auto-select,DFP-3:nvidia-auto-select"
[ 682.723] Loading extension NV-GLX
[ 682.769] (==) NVIDIA(0): Disabling shared memory pixmaps
[ 682.769] (==) NVIDIA(0): Backing store enabled
[ 682.769] (==) NVIDIA(0): Silken mouse enabled
[ 682.769] (==) NVIDIA(0): DPMS enabled
[ 682.769] Loading extension NV-CONTROL
[ 682.769] Loading extension XINERAMA
[ 682.769] (II) Loading sub module "dri2"
[ 682.769] (II) LoadModule: "dri2"
[ 682.769] (II) Module "dri2" already built-in
[ 682.769] (II) NVIDIA(0): [DRI2] Setup complete
[ 682.769] (II) NVIDIA(0): [DRI2] VDPAU driver: nvidia
NVidiaドライバ（346.82）を再インストールし、最新バージョン（355.06）を試してみましたが、問題は解決しません。また、以前に再生していたどの種類のビデオも問題なく再生できませんでした。
GLXが再び正しく機能するようにするにはどうすればよいですか？
編集する：glxinfoまた、以下は端末の出力です。
Error: couldn't find RGB GLX visual or fbconfig
私はこれがGLXが動作しないことを確認してくれると思います。また、私が実行するnvidia-settingsときOpenGL/GLXについて、理解します:
Failed to query the GLX server vendor.
ベストアンサー1
私はGPUドライバ（NVidia 349.16、x64）を台無しにしたカーネルのアップデートで問題が発生したことに気づきました。奇妙なことに、Ubuntuリポジトリから最新バージョンのNVidiaドライバをインストールしても問題は解決しません。ソフトウェアとアップデート>追加ドライバ（オープンソースバージョンと排他バージョンの両方を試してみましたが）問題が発生する前と同じバージョン（349.16）を手動でインストールする必要がありました。これで問題が解決しました。
2日間の調査の最後に、カーネルを更新するたびにNVidiaドライバを再インストールする必要があることがわかりました。 （しかし、ここで指摘したように、いくつかの解決策があります。https://askubuntu.com/questions/492217/nvidia-driver-reset-after-each-kernel-update）。唯一驚いたのは、私のグラフィックカード（Quadro K2200）をサポートする他の最新のNVidiaドライバをインストールしようとしたときに問題は解決しませんでしたが、この問題を解決するには以前と同じドライバが必要でした。