Roger Merritt, thank you for reporting this and helping make Ubuntu
better.
In Ubuntu 15.10, could you please run the following command once from a
terminal by ensuring you have the package xdiagnose installed, and that you
click the Yes button for attaching additional debugging information:
apport-collect -p xorg 1584284
** Tags added: regression-release
** Changed in: xorg (Ubuntu)
Importance: Undecided => Low
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1584284
Title:
Ubuntu 16.04 LiveCD does not boot on AMD A10 chip
Status in xorg package in Ubuntu:
Incomplete
Bug description:
I want to boot a Ubuntu LiveCD of 16.04 on a desktop box with an AMD
A10-5800K AGP, Gigabyte FA-42A75M-HD2 motherboard, 8 GB of RAM, and
no graphics card -- the Radeon HD 7660D graphics are done by the CPU.
When I try to boot I get an error message, "ERROR: no UMS support in
radeon module." When I edit the boot command line to add the parameter
'nomodeset' I first get an error message, "No UMS support on radeon
module," then the familiar aubergine background with the ubuntu logo
and the five dots below it changing from white to red and back again.
After twenty or thirty seconds the background goes to black, I get the
error message "No UMS support in radeon module," and the ubuntu logo
disappears but the five dots continue. After another twenty or thirty
seconds of that the screen clears, at the top is a line: "ubuntu 16.04
ubuntu LTS tty1," below that the line "ubuntu login:" and after a
second or less the screen goes black and I can't do anything except
reboot. I've tried old Live CDs, from 10.10 to 15.10, and they all
boot fine.
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