Ubuntu 15.04 + AMD,purple screen when booting after install,stuck at initramdisk

Question

I installed Ubuntu 15.04 on a Seagate expansion drive. I tried booting it up from my machine, but it hangs (and I waited over 30 mins, just to be sure).

I tried using the drive from an Intel based PC, and it worked like a charm.

I then tried loading up the drivers using this guide.

I am stuck at step 3.1.6, which says to run

sudo amdconfig --adapter=all --initial.

This did not work from the USB installer.

How do I resolve this issue?

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I tried using bootrepair, and the information it gave me is available here.

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Here is a screenshot of the GRUB2 configuration and boot line (click here for a new window link of this for full size so you can clearly see what's there):

I tried adding nomodeset to the grub2 screen in the the line containing Linux instead of quiet splash in recovery mode and upstart mode. I have tried replacing the $linux_gfx_mode with nomodeset.

In the recovery scenario, I see the message Loading initial ramdisk, where it then hangs. I have tried installing it on my internal hard drive as well,the results are no different. I have also updated my BIOS to this,however the problem persists.

I can chroot into the installation using this,here I tried to install the amd graphics drivers but it was unable to find them.

Is it nessecary to:

1. reinstall Ubuntu 15.04
2. install an older version of Ubuntu
3. fix GRUB

Or is there something else that I should do?

Answer 1

I never found a solution to this, I have ATI/AMD dual graphics, and have the same issues, xserver breaks after installing proprietary drivers from repositories, as well as from the ATI/AMD website.I even attempted updating to kernel 4.1, but to no avail.

My only solution has been to downgrade to Ubuntu 14.04.

Answer 2

Specifically for my laptop which is a Lenovo G505s,a solution exists. You would have to use Network Boot as the first option in the Boot Order menu. Once I got that working,I decieded not to mess with my system by installing proprietery drivers from AMD.

I found the solution at a link here,it is the third comment to the question by masterfink