doc@AMD:~$ sudo kdesu /etc/apt/sources.list
X Error: BadDevice, invalid or uninitialized input device 169
  Major opcode:  147
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
X Error: BadDevice, invalid or uninitialized input device 169
  Major opcode:  147
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
sh: /etc/apt/sources.list: Permission denied
doc@AMD:~$