• Ubuntu_baddevice_error

This error is not harmful. You can ignore it without any trouble to use eman.

If you think this is annoying and want to get rid of it, please do as following:

Seems a lot of users are getting the below errors when running applications from the console:

Code:

X Error: BadDevice, invalid or uninitialized input device 168
  Major opcode:  148
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
X Error: BadDevice, invalid or uninitialized input device 168
  Major opcode:  148
  Minor opcode:  3
  Resource id:  0x0
Failed to open device


To fix this, look for the lines posted below, or similar to, and comment them out of your /etc/X11/xorg.conf file:

Code:

# Section "InputDevice"
#  Driver        "wacom"
#  Identifier    "stylus"
#  Option        "Device"        "/dev/wacom"          # Change to
#                                                      # /dev/input/event
#                                                      # for USB
#  Option        "Type"          "stylus"
#  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
#EndSection

#Section "InputDevice"
#  Driver        "wacom"
#  Identifier    "eraser"
#  Option        "Device"        "/dev/wacom"          # Change to
#                                                      # /dev/input/event
#                                                      # for USB
#  Option        "Type"          "eraser"
#  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
#EndSection

#Section "InputDevice"
#  Driver        "wacom"
#  Identifier    "cursor"
#  Option        "Device"        "/dev/wacom"          # Change to
#                                                      # /dev/input/event
#                                                      # for USB
#  Option        "Type"          "cursor"
#  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
#EndSection


Then also a bit further down in the file you need to look for the below lines, or ones similar to these: 

Code:

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
#       InputDevice     "stylus" "SendCoreEvents"
#       InputDevice     "cursor" "SendCoreEvents"
#       InputDevice     "eraser" "SendCoreEvents"
EndSection


**WARNING** If you fail to comment the lines below that are commented out, then X will *NOT* start when you go to restart the X server.

Once you comment those things out then a restart of X is needed.  Once X is back up and running again you shouldn't see those errors anymore.

the solution is come from this link, I copy it here in case that link is not approachable.