install ubuntu 12.04 with ati hd radeon 6850

Question

The problem is that I can't even run installation, seems that the monitor isn't connected to PC.

I can't see anything, just black screen.

I had almost the same problem with Ubuntu 11.10 (couldn't solve it neither) though that newest version had better compability.

Answer 1

Try running the installation with

nomodeset

when the install is starting up, press Esc and then goto more options (I think... it's the right most option) and press Enter and select nomodeset. That should let you boot.