X Error: BadDevice, invalid or uninitialized input device 167
  Major opcode:  144
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
X Error: BadDevice, invalid or uninitialized input device 167
  Major opcode:  144
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
Segmentation fault (core dumped)
earl@ViziServer:~$ sudo apt-get install mono
Password:
Reading package lists... Done
Building dependency tree
Reading state information... Done
mono is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 128 not upgraded.
earl@ViziServer:~$