(Ctr+Alt+F1) in tty mode everething is fine including cursor. The problem with 
invisible mouse pointer (cursor) is only in graphical mode, on login screen and 
ubuntu desktop. The only error I can find is in  lightdm/x-0-greeter.log . See 
attach.
There fore I suspect that default distr has missing configuration file for 
lightdm+unity to work properly on my hardware.

** Attachment added: "log files from /var/log/lightdm"
   
https://bugs.launchpad.net/ubuntu/+bug/998308/+attachment/3145115/+files/lightdm.zip

** Package changed: ubuntu => lightdm (Ubuntu)

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https://bugs.launchpad.net/bugs/998308

Title:
  invisible mouse cursor in 12.04

Status in “lightdm” package in Ubuntu:
  Incomplete

Bug description:
  Issue
  ---
  12.04 64 bit Installation finished successfully with no errors. But nether 
login screen nor default desktop have mouse cursor. Mouse works but cursor 
pointer is completely invisible. However cursor shows up for little moment 
while in transition from login screen to desktop. 

  Facts
  ---
  - default config for gnome - Tried both upgrade from 10.04.04 to 12.04 and 
fresh  install of 12.04 from alternate.iso. Exactly same look with no cursor.
  - video drv ok - I use AST driver that manufacture validated with 12.04. 
Indeed there is no errors in X server log and it uses driver provided by AST. 
  - no hw issues - hw in use cpu E5520 chip-set X58. Was working fine with 
ubuntu 10.04 for years with no issues at all. 
  - no errors in X server log
  I see that combination of lightdm and unity-greeter is used but can not find 
error in log.
  What program is responsible to draw mouse cursor on default desktop in 12.04, 
how to narrow the issue?

  Posted on support forum - no reply -
  http://ubuntuforums.org/showthread.php?p=11927697

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