Public bug reported:

At random times, many keyboard shortcuts and special keys such as the following 
stop working:
- volume up/down/mute keys
- PrintScreen key and shift+PrintScreen shortcut
- Ctrl+Alt+T for terminal

and probably others. There are shortcuts that keep working, such as
Alt+Tab, and if I remember correctly also Ctrl+Super+D.

This happens quite rarely.

UNLIKE #1459571, which is (supposed to be) fixed, restarting unity-
settings-daemon does help, meaning it makes the shortcuts and keys work
again as expected.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160906-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
Uname: Linux 4.4.0-98-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.102  Mon Jan 16 13:06:29 
PST 2017
 GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Nov  9 16:45:13 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:0647]
 NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
InstallationDate: Installed on 2013-10-11 (1489 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Acer Aspire V3-571G
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-98-generic.efi.signed 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/15/2012
dmi.bios.vendor: Acer
dmi.bios.version: V2.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: VA50_HC_CR
dmi.board.vendor: Acer
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.07
dmi.modalias: 
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
dmi.product.name: Aspire V3-571G
dmi.product.version: V2.07
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Thu Nov  9 11:39:59 2017
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 NVIDIA(0): Failed to initiate mode change.
 NVIDIA(0): Failed to complete mode change
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.7

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial

** Description changed:

- At random times, keyboard shortcuts and special keys such as the following 
stop working:
+ At random times, many keyboard shortcuts and special keys such as the 
following stop working:
  - volume up/down/mute keys
  - PrintScreen key and shift+PrintScreen shortcut
  - Ctrl+Alt+T for terminal
  
  and probably others. There are shortcuts that keep working, such as
  Alt+Tab, and if I remember correctly also Ctrl+Super+D.
  
  This happens quite rarely.
  
  UNLIKE #1459571, which is (supposed to be) fixed, restarting unity-
  settings-daemon does help, meaning it makes the shortcuts and keys work
  again as expected.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unity 7.4.0+16.04.20160906-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
  Uname: Linux 4.4.0-98-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
-  NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.102  Mon Jan 16 13:06:29 
PST 2017
-  GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
+  NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.102  Mon Jan 16 13:06:29 
PST 2017
+  GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
  .tmp.unity_support_test.0:
-  
+ 
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Nov  9 16:45:13 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  GraphicsCard:
-  Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
-    Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:0647]
-  NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
-    Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
+  Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
+    Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:0647]
+  NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
+    Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
  InstallationDate: Installed on 2013-10-11 (1489 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V3-571G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-98-generic.efi.signed 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.modalias: 
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Thu Nov  9 11:39:59 2017
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
-  NVIDIA(0): Failed to initiate mode change.
-  NVIDIA(0): Failed to complete mode change
+  NVIDIA(0): Failed to initiate mode change.
+  NVIDIA(0): Failed to complete mode change
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.7

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https://bugs.launchpad.net/bugs/1731294

Title:
  Keyboard shortcuts stop working; restarting unity-settings-daemon
  fixes them

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