I am in the middle of trying to resolve the dreaded Radeon issue with the 2011 Macbook pro. I have created a bootable USB stick with everything I should need to eventually disable the Radeon GPU ahead of removing a sensor to complete the job. I am using the ubuntu-16.04.3-desktop-amd64.iso
There a couple of modifications to the created stick, with a new grub.cfg file to replace the existing one and the addition of a Radeondisable.sh file in the root of the stick to disable the GPU
When I boot into the stick, I select Try Ubuntu Without Installing, but it sits at a black screen and does nothing. Mine doesn't look exactly like images I have seen, with a * appearing before the words Try Ubuntu......
Any help gladly accepted
By the way, I have already seen to type e after selecting Try Ubuntu...... but nothing happens when I do that; no possibly to edit at that point