I put radeonhd video driver instead of Update-Manager chosen driver.
It works.
But the problem is still HOT because the Update-Manager ( during upgrade process ) don't recognize my RadeonHD so he chose for me a wrong driver >>> then the blank screen and the rest ....
If this will be not solved ...a lot of Ubuntu Hardy machines (with RadeonHD) ..upgrading to Ibex will have the same problem.
UPDATE - Problem Solved ( at least for me )...
I put radeonhd video driver instead of Update-Manager chosen driver.
It works.
But the problem is still HOT because the Update-Manager ( during upgrade process ) don't recognize my RadeonHD so he chose for me a wrong driver >>> then the blank screen and the rest ....
If this will be not solved ...a lot of Ubuntu Hardy machines (with RadeonHD) ..upgrading to Ibex will have the same problem.